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##### The mathematical science that deals with the collection,-(Answered)

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Question

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

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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

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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

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Question 24

1 pts

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

from its mode.

True

Fals

e

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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

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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

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Question 27

1 pts

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

is not true.

True

Fals

e

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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

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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

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Question 30

1 pts

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

then we accept the null hypothesis.

True

Fals

e

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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?

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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.

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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.

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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.

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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.

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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

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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.

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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?

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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?

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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.

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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.

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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.

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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.

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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.

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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?

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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?

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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?

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Question 49

3 pts

Consider the following hypothesis:

H

1

:

?&gt;

25

Given that calculate the test statistic.

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Question 50

3 pts

Consider the following hypothesis:

H

1

:

?&gt;

25

Given that state the critical value.

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Question 51

1 pts

Consider the following hypothesis:

H

1

:

?&gt;

25

Given that determine whether or not the null hypothesis should

be rejected.

Reject the null hypothesis

Fail to reject the null

hypothesis

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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?

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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?

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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?

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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?

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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?

Paper#9209407 | Written in 27-Jul-2016

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