Description
Question
Quiz Instructions
This exam consists of 25 multiple choice questions, 10 true/false questions, and 21 numerical response questions.
Once you open the exam, you will have 4 hours (240 minutes) to complete it. The exam MUST be completed in 4 hours. You may use your book, notes, and online material for this exam. You may NOT, however, get any help from another person. Ninety minutes should be an adequate amount of time to comfortably complete this exam.?You will run out of time if you try to look up the answer to each problem!
You are welcome to use Excel for the calculation problems.?Be sure to round answers to at least two decimals!?You will not get credit for the answer 3.1 if the actual answer is 3.1157, but you would get credit for 3.12, 3.116, or 3.1157.
DO NOT?use Internet Explorer to take this exam. You should use Mozilla Firefox or Google Chrome.
Note: this is a timed quiz. You may check the remaining time you have at any point while taking the quiz by pressing the keyboard combination SHIFT, ALT, and T... Again: SHIFT, ALT, and T...? Flag this Question Question 11?pts The mathematical science that deals with the collection, analysis, and presentation of data is
? Flag this Question Question 21?pts Sampling error is the difference between the __________ and the parameter.
? Flag this Question Question 31?pts The __________ is the probability distribution used in place of the normal distribution to calculate a confidence interval when the population standard deviation is unknown.
? Flag this Question Question 41?pts A __________ is a distribution in which the probability of any interval occurring is equal to any other interval with the same width.
? Flag this Question Question 51?pts The number of rushing touchdowns for the Minnesota Vikings in a season is an example of
? Flag this Question Question 61?pts Which is a continuous random variable?
The number of students in an ECO 250 class. 
The hourly earnings of a call center employee in Boston. 
The number of fives obtained in four rolls of a die. 
The number of births in a hospital on a given day. 
? Flag this Question Question 71?pts The empirical rule states if a distribution is symmetrical and bellshaped, approximately 68%, 95%, and _______ of its data values will fall within one, two, and three standard deviations above and below the mean, respectively.
? Flag this Question Question 81?pts __________ is the probability that the interval estimate will include the population parameter of interest, such as a mean.
? Flag this Question Question 91?pts The __________ is a variable that represents the probability that any given confidence interval will not contain the true population mean.
? Flag this Question Question 101?pts What is an error that occurs when the null hypothesis is rejected when, in reality, it is true?
? Flag this Question Question 111?pts Which is a time series variable?
VISA balances of 30 students on December 31 of this year. 
Titles of the top 10 movies in total revenue last week 
Net earnings reported by Xena Corp for the last 10 quarters. 
Dollar exchange rates yesterday against 10 other world currencies 
? Flag this Question Question 121?pts A tire company performs qualitycontrol tests on the monthly output of its bestselling model tire at each of its plants. Each month a random sample of 25 tires is selected from each plant and tested to see if the average tread life of that plant?s tires is above specifications. For one plant, the random sample of 25 tires had a sample mean of 39,500 miles and a sample standard deviation of 3,300 miles. The company performs a hypothesis test at the .05 level of significance to see if there is evidence that the average tread life is greater than 38,000. Based on this sample, the company should:
Reject the null hypothesis and conclude there is evidence that the average tread life is greater than 38,000 miles. 
Fail to reject the null hypothesis and conclude there is evidence that the average tread life is greater than 38,000 miles 
Fail to reject the null hypothesis and conclude there is not evidence that the average tread life is greater than 38,000 miles. 
Reject the null hypothesis and conclude there is not evidence that the average tread life is greater than 38,000 miles. 
? Flag this Question Question 131?pts What is the probability of observing a sample mean at least as extreme as the one selected for the hypothesis test, assuming the null hypothesis is true?
? Flag this Question Question 141?pts Which is?
not?a characteristic of a binomial experiment?
Each trial has only two possible outcomes: a success or a failure 
Each trial is independent of the other trials in the experiment 
The experiment consists of an infinite number of trials. 
The probability of success is equal to one minus the probability of failure 
? Flag this Question Question 151?pts A __________ is a continuous distribution that is bell shaped and symmetrical around the mean.
? Flag this Question Question 161?pts The critical zscore for an 85% confidence level is ________.
? Flag this Question Question 171?pts YouTube would like to test the hypothesis that the average length of an online video watched by a user is more than 6 minutes. A random sample of 40 people watched online videos that averaged 6.6 minutes in length. The population standard deviation for the length of online videos is 1.7 minutes. YouTube would like to set??=0.05. The?
pvalue for this hypothesis test would be _________.
? Flag this Question Question 181?pts A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam is equal to 45 minutes. The correct hypothesis statement would be
? Flag this Question Question 191?pts What should you do when the?pvalue is less than the significance level? Fail to reject the null hypothesis 
Reject the null hypothesis 
Accept the alternative hypothesis 
Accept the null hypothesis  ? Flag this Question Question 201?pts Consider the following set of numbers: 10, 25, 13, 18, 40, 5. Determine the median and variance of these data. median = 15.5, variance = 35 
median = 18.5, variance = 473.83 
median = 15.5, variance = 157.9 
median = 18.5, variance = 12.57  ? Flag this Question Question 211?pts A point estimate, also called a statistic, is a single value that describes the population of interest, with the sample mean being the most common. ? Flag this Question Question 221?pts The margin of error is the width of the confidence interval between the lower limit and the upper limit. ? Flag this Question Question 231?pts The alternative hypothesis represents the status quo and involves stating the belief that the population parameter is??a specific value and is always associated with the equal sign. ? Flag this Question Question 241?pts A zscore measures the number of standard deviations a value is from its mode. ? Flag this Question Question 251?pts Suppose Nike's average stock price this year is $15.00 with a standard deviation of $3.00, and Under Armour's average stock price this year is $24.00 with a standard deviation of $4.00. According to this data, Nike's stock price is more consistent than Under Armour's stock price. ? Flag this Question Question 261?pts The Central Limit Theorem states that sample means, drawn from a normally distributed population, will be normally distributed. ? Flag this Question Question 271?pts A low?pvalue indicates a high probability that the null hypothesis is not true. ? Flag this Question Question 281?pts If the absolute value of the test statistic is less than the critical value in a twotailed hypothesis test, then the decision is to reject the null hypothesis. ? Flag this Question Question 291?pts Consider the hypotheses H_{0}: Defendant is innocent H_{1}: Defendant is guilty If a court acquits every defendant, they will never commit Type II error. ? Flag this Question Question 301?pts If we do not have evidence to support the alternative hypothesis, then we accept the null hypothesis. ? Flag this Question Question 311?pts Suppose the average puppy weighs 10 pounds. A sample of 10 puppies yields a sample mean of 13.2 pounds and a sample standard deviation of 2.78 pounds.?Assume the population standard deviation is known to be 5.25.You want to test whether the sample mean differs from the population mean of 10 pounds at a 5 percent level of significance using a twotailed test. What are your null and alternative hypotheses? ? Flag this Question Question 323?pts Suppose the average puppy weighs 10 pounds. A sample of 10 puppies yields a sample mean of 13.2 pounds and a sample standard deviation of 2.78 pounds.?Assume the population standard deviation is known to be 5.25.You want to test whether the sample mean differs from the population mean of 10 pounds at a 5 percent level of significance using a twotailed test. Calculate the test statistic for the sample data. ? Flag this Question Question 333?pts Suppose the average puppy weighs 10 pounds. A sample of 10 puppies yields a sample mean of 13.2 pounds and a sample standard deviation of 2.78 pounds.?Assume the population standard deviation is known to be 5.25.You want to test whether the sample mean differs from the population mean of 10 pounds at a 5 percent level of significance using a twotailed test. State the critical value. ? Flag this Question Question 341?pts Suppose the average puppy weighs 10 pounds. A sample of 10 puppies yields a sample mean of 13.2 pounds and a sample standard deviation of 2.78 pounds.?Assume the population standard deviation is known to be 5.25.You want to test whether the sample mean differs from the population mean of 10 pounds at a 5 percent level of significance using a twotailed test. Determine whether or not the null hypothesis should be rejected. Reject the null hypothesis. 
Fail to reject the null hypothesis.  ? Flag this Question Question 353?pts Consider the following data on the number of beers consumed by a sample of football fans during a game: 3  ? ?5  ? ?0  ? ?2  ? ?5  ? ?3. 
? Calculate the mean number of beers. ? Flag this Question Question 363?pts Consider the following data on the number of beers consumed by a sample of football fans during a game: 3  ? ?5  ? ?0  ? ?2  ? ?5  ? ?3. 
? Calculate the median. ? Flag this Question Question 373?pts Consider the following data on the number of beers consumed by a sample of football fans during a game: 3  ? ?5  ? ?0  ? ?2  ? ?5  ? ?3. 
Calculate the mode (mark all that apply). ? Flag this Question Question 383?pts Consider the following data on the number of beers consumed by a sample of football fans during a game: 3  ? ?5  ? ?0  ? ?2  ? ?5  ? ?3. 
Calculate the variance. ? Flag this Question Question 393?pts You check the weather forecast every morning. On average, it is rainy 20 percent of the time. Consider the next 5 days. What is the probability it will be rainy exactly 1 day? ? Flag this Question Question 403?pts You check the weather forecast every morning. On average, it is rainy 20 percent of the time. Consider the next 5 days. What is the probability it will be rainy at most 2 days? ? Flag this Question Question 413?pts The average batter life of the iPhone 4S is reported to be 6.0 hours by Apple. Assume that the population standard deviation for the better life for this cell phone is 30 minutes. A random sample of 50 iPhones had an average better life of 5.7 hours. Determine the margin of error (in hours) for the 90% confidence interval for this sample. ? Flag this Question Question 423?pts The average batter life of the iPhone 4S is reported to be 6.0 hours by Apple. Assume that the population standard deviation for the better life for this cell phone is 30 minutes. A random sample of 50 iPhones had an average better life of 5.7 hours. Determine the lower confidence limit (LCL), in hours, for the 90% confidence interval for this sample. ? Flag this Question Question 433?pts The average batter life of the iPhone 4S is reported to be 6.0 hours by Apple. Assume that the population standard deviation for the better life for this cell phone is 30 minutes. A random sample of 50 iPhones had an average better life of 5.7 hours. Determine the upper confidence limit (UCL), in hours, for the 90% confidence interval for this sample. ? Flag this Question Question 443?pts Consider the following discrete probability distribution. ? ? X ? ?  ? ? P(X) ? ?  0  0.2  1  0.3  2  0.4  3  0.1  Total  1.0 
Calculate the mean of this distribution. ? Flag this Question Question 453?pts Consider the following discrete probability distribution. ? ? X ? ?  ? ? P(X) ? ?  0  0.2  1  0.3  2  0.4  3  0.1  Total  1.0 
Calculate the variance?of this distribution. ? Flag this Question Question 463?pts The commute time to work for a particular employee follows a continuous uniform distribution with a minimum time of 9 minutes and a maximum time of 25 minutes. What is the mean of this distribution? ? Flag this Question Question 473?pts The commute time to work for a particular employee follows a continuous uniform distribution with a minimum time of 9 minutes and a maximum time of 25 minutes. What is the probability that the employee's next commute to work will require less than 10 minutes? ? Flag this Question Question 483?pts The commute time to work for a particular employee follows a continuous uniform distribution with a minimum time of 9 minutes and a maximum time of 25 minutes. What is the probability that the employee's next commute time will require between 12 minutes and 20 minutes? ? Flag this Question Question 493?pts Consider the following hypothesis:
H1:?>25 Given that??calculate the test statistic. ? Flag this Question Question 503?pts Consider the following hypothesis:
H1:?>25 Given that??state the critical value. ? Flag this Question Question 511?pts Consider the following hypothesis:
H1:?>25 Given that??determine whether or not the null hypothesis should be rejected. Reject the null hypothesis 
Fail to reject the null hypothesis  ? Flag this Question Question 521?pts A tire manufacturer selected a random sample of 50 tires of a particular model chosen from the past month?s production and used destructive testing to determine the tread life of each tire. The sample mean was 42,300 miles and the sample standard deviation was 7,500 miles. What is the 95% confidence interval estimate for the tread life of that entire model produced in the past month? ? Flag this Question Question 533?pts Suppose the average number of complaints received by Christiana Hospital from patients is 7.4 every four weeks. Assume the number of complaints per month follows the Poisson distribution. What is the probability of?exactly four complaints during the next four weeks? ? Flag this Question Question 543?pts Suppose the average number of complaints received by Christiana Hospital from patients is 7.4 every four weeks. Assume the number of complaints per month follows the Poisson distribution. What is the probability of?four or more complaints during the next four weeks? ? Flag this Question Question 553?pts Suppose the average number of complaints received by Christiana Hospital from patients is 7.4 every four weeks. Assume the number of complaints per month follows the Poisson distribution. What is the probability of exactly three complaints during the next two weeks? ? Flag this Question Question 563?pts Zombies eat, on average, 5 brains per day. Assume the actual number of brains eaten per day follows the normal distribution with a standard deviation of 0.29 brains. What is the probability that a zombie will eat exactly 3.2 brains tomorrow? 





Quiz Instructions
This exam consists of 25 multiple choice questions, 10 true/false questions, and 21 numerical response
questions.
Once you open the exam, you will have 4 hours (240 minutes) to complete it. The exam MUST be
completed in 4 hours. You may use your book, notes, and online material for this exam. You may NOT,
however, get any help from another person. Ninety minutes should be an adequate amount of time to
comfortably complete this exam. You will run out of time if you try to look up the answer to each problem!
You are welcome to use Excel for the calculation problems. Be sure to round answers to at least two
decimals! You will not get credit for the answer 3.1 if the actual answer is 3.1157, but you would get credit
for 3.12, 3.116, or 3.1157.
DO NOT use Internet Explorer to take this exam. You should use Mozilla Firefox or Google Chrome.
Note: this is a timed quiz. You may check the remaining time you have at any point while taking the quiz
by pressing the keyboard combination SHIFT, ALT, and T... Again: SHIFT, ALT, and T...
Flag this Question
Question 11 pts
The mathematical science that deals with the collection, analysis, and
presentation of data is
Economics
Statistics
Mathematical analysis
Data analysis
Flag this Question
Question 21 pts
Sampling error is the difference between the __________ and the parameter.
Statistic
None of the above
Sample mode
Sample
Flag this Question
Question 31 pts
The __________ is the probability distribution used in place of the normal
distribution to calculate a confidence interval when the population standard
deviation is unknown.
Exponential
distribution
Binomial distribution
Uniform distribution
Student's t?
distribution
Flag this Question
Question 41 pts
A __________ is a distribution in which the probability of any interval occurring is
equal to any other interval with the same width.
Student's t?
distribution
Normal distribution
Uniform distribution
Binomial
distribution
Flag this Question
Question 51 pts
The number of rushing touchdowns for the Minnesota Vikings in a season is an
example of
Interval
data
Ratio data
Ordinal data
Nominal data
Flag this Question
Question 61 pts
Which is a continuous random variable?
The number of students in an ECO 250 class.
The hourly earnings of a call center employee in Boston.
The number of fives obtained in four rolls of a die.
The number of births in a hospital on a given day.
Flag this Question
Question 71 pts
The empirical rule states if a distribution is symmetrical and bellshaped,
approximately 68%, 95%, and _______ of its data values will fall within one, two,
and three standard deviations above and below the mean, respectively.
99%
99.5%
99.7%
98%
Flag this Question
Question 81 pts
__________ is the probability that the interval estimate will include the population
parameter of interest, such as a mean.
Degrees of freedom
Significance level
Confidence
level
Margin of error
Flag this Question
Question 91 pts
The __________ is a variable that represents the probability that any given
confidence interval will not contain the true population mean.
Significance level
Degrees of freedom
Margin of error
Confidence
level
Flag this Question
Question 101 pts
What is an error that occurs when the null hypothesis is rejected when, in reality,
it is true?
Sampling error
Type II error
None of the above
Type I error
Flag this Question
Question 111 pts
Which is a time series variable?
VISA balances of 30 students on December 31 of this year.
Titles of the top 10 movies in total revenue last week
Net earnings reported by Xena Corp for the last 10 quarters.
Dollar exchange rates yesterday against 10 other world
currencies
Flag this Question
Question 121 pts
A tire company performs qualitycontrol tests on the monthly output of its bestselling model tire at each of its plants. Each month a random sample of 25 tires is
selected from each plant and tested to see if the average tread life of that plant?s
tires is above specifications. For one plant, the random sample of 25 tires had a
sample mean of 39,500 miles and a sample standard deviation of 3,300 miles.
The company performs a hypothesis test at the .05 level of significance to see if
there is evidence that the average tread life is greater than 38,000. Based on this
sample, the company should:
Reject the null hypothesis and conclude there is evidence that the average tread life is greater than 38,000
miles.
Fail to reject the null hypothesis and conclude there is evidence that the average tread life is greater than
38,000 miles
Fail to reject the null hypothesis and conclude there is not evidence that the average tread life is greater
than 38,000 miles.
Reject the null hypothesis and conclude there is not evidence that the average tread life is greater than
38,000 miles.
Flag this Question
Question 131 pts
What is the probability of observing a sample mean at least as extreme as the
one selected for the hypothesis test, assuming the null hypothesis is true?
Alpha
Beta
Confidence
level
p?value
Flag this Question
Question 141 pts
Which is not a characteristic of a binomial experiment?
Each trial has only two possible outcomes: a success or a
failure
Each trial is independent of the other trials in the experiment
The experiment consists of an infinite number of trials.
The probability of success is equal to one minus the probability of
failure
Flag this Question
Question 151 pts
A __________ is a continuous distribution that is bell shaped and symmetrical
around the mean.
Binomial
distribution
Uniform distribution
Normal distribution
Exponential
distribution
Flag this Question
Question 161 pts
The critical zscore for an 85% confidence level is ________.
1.96
1.44
1.28
2.33
Flag this Question
Question 171 pts
YouTube would like to test the hypothesis that the average length of an online
video watched by a user is more than 6 minutes. A random sample of 40 people
watched online videos that averaged 6.6 minutes in length. The population
standard deviation for the length of online videos is 1.7 minutes. YouTube would
like to set
_________.
?=0.05. The pvalue for this hypothesis test would be
0.0644
0.0129
0.0268
0.0395
Flag this Question
Question 181 pts
A professor would like to test the hypothesis that the average number of minutes
that a student needs to complete a statistics exam is equal to 45 minutes. The
correct hypothesis statement would be
Flag this Question
Question 191 pts
What should you do when the pvalue is less than the significance level?
Fail to reject the null
hypothesis
Reject the null hypothesis
Accept the alternative
hypothesis
Accept the null hypothesis
Flag this Question
Question 201 pts
Consider the following set of numbers: 10, 25, 13, 18, 40, 5. Determine the
median and variance of these data.
median = 15.5, variance = 35
median = 18.5, variance = 473.83
median = 15.5, variance =
157.9
median = 18.5, variance =
12.57
Flag this Question
Question 211 pts
A point estimate, also called a stati
Paper#9208854  Written in 27Jul2016
Price : $22