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I am in dyer need of Bus Stats Eco 250 help. I have an exam due tonight at 11:59. If someone could please help me. I have the document attached


The mathematical science that deals with the collection, analysis,

 

and presentation of data is

 

Mathematical

 

analysis

 

Economics

 

Data analysis

 

Statistics

 


 

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Question 2

 

1 pts

 


 

Sampling error is the difference between the __________ and the

 

parameter.

 

Sample

 

Statistic

 

Sample mode

 

None of the

 

above

 


 

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Question 3

 

1 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.

 

Student's tdistribution

 

Exponential

 

distribution

 


 

Binomial

 

distribution

 

Uniform distribution

 


 

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Question 4

 

1 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 tdistribution

 

Uniform distribution

 

Normal distribution

 

Binomial

 

distribution

 


 

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Question 5

 

1 pts

 


 

The number of rushing touchdowns for the Minnesota Vikings in a

 

season is an example of

 

Interval

 

data

 

Nominal

 

data

 

Ordinal

 

data

 

Ratio data

 


 

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Question 6

 

1 pts

 


 

Which is a continuous random variable?

 

The number of births in a hospital on a given day.

 

The number of fives obtained in four rolls of a

 

die.

 

The number of students in an ECO 250 class.

 

The hourly earnings of a call center employee in

 

Boston.

 


 

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Question 7

 

1 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.

 

98%

 

99.5

 

%

 

99.7

 

%

 

99%

 


 

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Question 8

 

1 pts

 


 

__________ is the probability that the interval estimate will include

 

the population parameter of interest, such as a mean.

 

Significance

 

level

 

Margin of error

 

Confidence level

 

Degrees of

 

freedom

 


 

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Question 9

 

1 pts

 


 

The __________ is a variable that represents the probability that

 

any given confidence interval will not contain the true population

 

mean.

 

Degrees of

 

freedom

 

Confidence level

 

Significance

 

level

 

Margin of error

 


 

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Question 10

 

1 pts

 


 

What is an error that occurs when the null hypothesis is rejected

 

when, in reality, it is true?

 

Type I error

 

Sampling error

 


 

None of the

 

above

 

Type II error

 


 

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Question 11

 

1 pts

 


 

Which is a time series variable?

 

Titles of the top 10 movies in total revenue last week

 

VISA balances of 30 students on December 31 of this

 

year.

 

Net earnings reported by Xena Corp for the last 10

 

quarters.

 

Dollar exchange rates yesterday against 10 other world

 

currencies

 


 

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Question 12

 

1 pts

 


 

A tire company performs quality-control tests on the monthly

 

output of its best-selling 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:

 

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.

 

Fail to reject the null hypothesis and conclude there is evidence that

 

the average tread life is greater than 38,000 miles

 

Reject the null hypothesis and conclude there is evidence that the

 

average tread life is greater than 38,000 miles.

 


 

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Question 13

 

1 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?

 

Beta

 

Confidence

 

level

 

Alpha

 

p-value

 


 

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Question 14

 

1 pts

 


 

Which is not a characteristic of a binomial experiment?

 

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

 

Each trial has only two possible outcomes: a success or a

 

failure

 


 

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Question 15

 

1 pts

 


 

A __________ is a continuous distribution that is bell shaped and

 

symmetrical around the mean.

 

Exponential

 

distribution

 

Uniform distribution

 

Normal distribution

 

Binomial

 

distribution

 


 

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Question 16

 

1 pts

 


 

The critical z-score for an 85% confidence level is ________.

 

2.33

 

1.96

 

1.28

 

1.44

 


 

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Question 17

 

1 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 p-value for this hypothesis test would be _________.

 

0.03

 

95

 

0.02

 

68

 

0.06

 

44

 

0.01

 

29

 


 

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Question 18

 

1 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

 


 

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Question 19

 

1 pts

 


 

What should you do when the p-value is less than the significance

 

level?

 

Fail to reject the null

 

hypothesis

 

Reject the null hypothesis

 

Accept the null hypothesis

 

Accept the alternative

 

hypothesis

 


 

Flag this Question

 


 

Question 20

 

1 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 =

 

157.9

 

median = 18.5, variance =

 

473.83

 

median = 15.5, variance =

 

35

 

median = 18.5, variance =

 

12.57

 


 

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Question 21

 

1 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.

 

True

 

Fals

 

e

 


 

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Question 22

 

1 pts

 


 

The margin of error is the width of the confidence interval

 

between the lower limit and the upper limit.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 23

 

1 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.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 24

 

1 pts

 


 

A z-score measures the number of standard deviations a value is

 


 

from its mode.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 25

 

1 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.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 26

 

1 pts

 


 

The Central Limit Theorem states that sample means, drawn from

 

a normally distributed population, will be normally distributed.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 27

 

1 pts

 


 

A low p-value indicates a high probability that the null hypothesis

 

is not true.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 28

 

1 pts

 


 

If the absolute value of the test statistic is less than the critical

 

value in a two-tailed hypothesis test, then the decision is to reject

 

the null hypothesis.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 29

 

1 pts

 


 

Consider the hypotheses

 

H0: Defendant is innocent

 

H1: Defendant is guilty

 

If a court acquits every defendant, they will never commit Type II

 

error.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 30

 


 

1 pts

 


 

If we do not have evidence to support the alternative hypothesis,

 

then we accept the null hypothesis.

 

True

 

Fals

 

e

 


 

Flag this Question

 


 

Question 31

 

1 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 two-tailed test. What

 

are your null and alternative hypotheses?

 


 

Flag this Question

 


 

Question 32

 

3 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 two-tailed test.

 


 

Calculate the test statistic for the sample data.

 


 

Flag this Question

 


 

Question 33

 

3 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 two-tailed test. State

 

the critical value.

 


 

Flag this Question

 


 

Question 34

 

1 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 two-tailed test.

 

Determine whether or not the null hypothesis should be rejected.

 

Fail to reject the null

 

hypothesis.

 

Reject the null hypothesis.

 


 

Flag this Question

 


 

Question 35

 


 

3 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.

 


 

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Question 36

 

3 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 37

 

3 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).

 

0

 

3

 

2

 

5

 


 

Flag this Question

 


 

Question 38

 

3 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 39

 

3 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 40

 

3 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 41

 

3 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 42

 

3 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 43

 

3 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 44

 


 

3 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 45

 

3 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 46

 

3 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 47

 

3 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 48

 

3 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 49

 

3 pts

 


 

Consider the following hypothesis:

 

H

 

1

 


 

:

 

?>

 


 

25

 

Given that calculate the test statistic.

 


 

Flag this Question

 


 

Question 50

 

3 pts

 


 

Consider the following hypothesis:

 

H

 

1

 


 

:

 

?>

 

25

 

Given that state the critical value.

 


 

Flag this Question

 


 

Question 51

 

1 pts

 


 

Consider the following hypothesis:

 

H

 

1

 


 

:

 

?>

 

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 52

 

1 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 53

 

3 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 54

 

3 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 55

 

3 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 56

 

3 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?

 


 

 

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