Question 1

2pts

A consumer analyst reports that the mean life of a certain type of alkaline battery is no more than 63 months. Write the null and alternative hypotheses and note which is the claim.

Homework Help:

6DA. Theory and basics of writing hypotheses

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(DOCX)

Group of answer choices

Ho: = 63 (claim), Ha: 63

Ho: 63, Ha: > 63 (claim)

Ho: > 63 (claim), Ha: 63

Ho: 63 (claim), Ha: > 63

Flag question: Question 2

Question 2

2pts

An amusement park claims that the average daily attendance is at least 20,000. Write the null and alternative hypotheses and note which is the claim.

Homework Help:

6DA. Theory and basics of writing hypotheses

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(DOCX)

Group of answer choices

Ho: 20000, Ha: > 20000 (claim)

Ho: > 20000 (claim), Ha: = 20000

Ho: = 20000, Ha: 20000 (claim)

Ho: 20000 (claim), Ha: < 20000

Flag question: Question 3

Question 3

2pts

If the null hypothesis is rejected when it is true, this is called __________.

Homework Help:

6DB. Type I and type II errors

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(DOCX)

Group of answer choices

a type II error

an alternative hypothesis

the Empirical Rule

>a type I error

Flag question: Question 4

Question 4

2pts

A scientist claims that the mean gestation period for a fox is less than 50.3 weeks. If a hypothesis test is performed that rejects the null hypothesis, how would this decision be interpreted?

Homework Help:

6VA. Overview of hypothesis testing: hypotheses, conclusions, implications for claim

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(4:32)

6DC. Connecting reject/fail to reject decision and implication for claim

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(DOCX)

Group of answer choices

The evidence indicates that the gestation period is more than 50.3 weeks

There is not enough evidence to support the scientist's claim that the gestation period is more than 50.3 weeks

There is enough evidence to support the scientist's claim that the gestation period is less than 50.3 weeks

There is not enough evidence to support the scientist's claim that the gestation period is 50.3 weeks

Flag question: Question 5

Question 5

2pts

A marketing organization claims that none of its employees are paid minimum wage. If a hypothesis test is performed that fails to reject the null hypothesis, how would this decision be interpreted?

Homework Help:

6VA. Overview of hypothesis testing: hypotheses, conclusions, implications for claim

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(4:32)

6DC. Connecting reject/fail to reject decision and implication for claim

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(DOCX)

Group of answer choices

There is sufficient evidence to support the claim that some of the employees are paid minimum wage

There is not sufficient evidence to support the claim that none of the employees are paid minimum wage

There is not sufficient evidence to support the claim that some of the employees are paid minimum wage

There is sufficient evidence to support the claim that none of the employees are paid minimum wage

Flag question: Question 6

Question 6

2pts

A sprinkler manufacturer claims that the average activating temperatures is at least 135 degrees. To test this claim, you randomly select a sample of 32 systems and find the mean activation temperature to be 133 degrees. Assume the population standard deviation is 3.3 degrees. Find the standardized test statistic and the corresponding p-value.

Homework Help:

6VB. Hypothesis testing with spreadsheet to find test statistic and p-value

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(2:58)

Group of answer choices

z-test statistic = 3.43, p-value = 0.0006

z-test statistic = -3.43, p-value = 0.0006

z-test statistic = 3.43, p-value = 0.0003

z-test statistic = -3.43, p-value = 0.0003

Flag question: Question 7

Question 7

2pts

A consumer research organization states that the mean caffeine content per 12-ounce bottle of a population of caffeinated soft drinks is 37.8 milligrams. You find a random sample of 48 12-ounce bottles of caffeinated soft drinks that has a mean caffeine content of 34.8 milligrams. Assume the population standard deviation is 12.5 milligrams. At =0.05, do you support or reject the organization's claim using the test statistic?

Homework Help:

6VC. Determining when to reject or fail to reject, both methods

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(4:00)

6VE. Second sample hypothesis testing from word problem to implications for claim, with test statistic

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(3:26)

6DD. Determining when to reject or fail to reject, both methods

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(DOCX)

Group of answer choices

Claim is null, fail to reject the null and reject claim as test statistic (-1.66) is not in the rejection region defined by the critical value (-1.96)

Claim is alternative, reject the null and reject claim as test statistic (-1.66) is in the rejection region defined by the critical value (-1.64)

Claim is null, reject the null and support claim as test statistic (-1.66) is in the rejection region defined by the critical value (-1.96)

Claim is alternative, fail to reject the null and support claim as test statistic (-1.66) is not in the rejection region defined by the critical value (-1.64)

Flag question: Question 8

Question 8

2pts

A computer manufacturer estimates that its cheapest screens will last less than 2.8 years. A random sample of 61 of these screens has a mean life of 2.5 years. The population is normally distributed with a population standard deviation of 0.88 years. At =0.02, what type of test is this and can you support the organization's claim using the test statistic?

Homework Help:

6VC. Determining when to reject or fail to reject, both methods

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(4:00)

6VE. Second sample hypothesis testing from word problem to implications for claim, with test statistic

(Links to an external site.)

(3:26)

6DD. Determining when to reject or fail to reject, both methods

(Links to an external site.)

(DOCX)

Group of answer choices

Claim is null, fail to reject the null and cannot support claim as test statistic (-2.66) is in the rejection region defined by the critical value (-2.05)

Claim is alternative, fail to reject the null and cannot support claim as test statistic (-2.66) is in the rejection region defined by the critical value (-2.05)

Claim is alternative, reject the null and support claim as test statistic (-2.66) is in the rejection region defined by the critical value (-2.05)

Claim is null, reject the null and support claim as test statistic (-2.66) is in the rejection region defined by the critical value (-2.05)

Flag question: Question 9

Question 9

2pts

A business receives supplies of copper tubing where the supplier has said that the average length is 26.70 inches so that they will fit into the business' machines. A random sample of 48 copper tubes finds they have an average length of 26.77 inches. The population standard deviation is assumed to be 0.20 inches. At =0.05, should the business reject the supplier's claim?

Homework Help:

6VD. Sample hypothesis testing from word problem to implications for claim, with p-values

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(3:15)

Group of answer choices

Yes, since p>, we fail to reject the null and the null is the claim

No, since p>, we fail to reject the null and the null is the claim

Yes, since p<, we reject the null and the null is the claim

No, since p>, we reject the null and the null is the claim

Flag question: Question 10

Question 10

2pts

The company's cleaning service states that they spend more than 46 minutes each time the cleaning service is there. The company times the length of 37 randomly selected cleaning visits and finds the average is 47.6 minutes. Assuming a population standard deviation of 5.2 minutes, can the company support the cleaning service's claim at =0.10?

Homework Help:

6VD. Sample hypothesis testing from word problem to implications for claim, with p-values

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(3:15)

Group of answer choices

No, since p<, we reject the null. The claim is the alternative, so the claim is not supported

Yes, since p>, we fail to reject the null. The claim is the null, so the claim is supported

No, since p>, we fail to reject the null. The claim is the alternative, so the claim is not supported

Yes, since p<, we reject the null. The claim is the alternative, so the claim is supported

Flag question: Question 11

Question 11

2pts

A customer service phone line claims that the wait times before a call is answered by a service representative is less than 3.3 minutes. In a random sample of 62 calls, the average wait time before a representative answers is 3.26 minutes. The population standard deviation is assumed to be 0.29 minutes. Can the claim be supported at =0.08?

Homework Help:

6VE. Second sample hypothesis testing from word problem to implications for claim, with test statistic

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(3:26)

Group of answer choices

No, since test statistic is not in the rejection region defined by the critical value, reject the null. The claim is the alternative, so the claim is not supported

Yes, since test statistic is in the rejection region defined by the critical value, reject the null. The claim is the alternative, so the claim is supported

Yes, since test statistic is in the rejection region defined by the critical value, fail to reject the null. The claim is the alternative, so the claim is supported

No, since test statistic is not in the rejection region defined by the critical value, fail to reject the null. The claim is the alternative, so the claim is not supported

Flag question: Question 12

Question 12

2pts

In a hypothesis test, the claim is 40 while the sample of 40 has a mean of 41 and a population standard deviation of 5.9 from a normally distributed data set. In this hypothesis test, would a z test statistic be used or a t test statistic and why?

Homework Help:

6DE. When to use z and when to use t distribution

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(DOCX)

Group of answer choices

t test statistic would be used as the data are normally distributed with an unknown population standard deviation

z test statistic would be used as the mean and sample size are the same

z test statistic would be used as the population standard deviation is known

t test statistic would be used as the population standard deviation is known

Flag question: Question 13

Question 13

2pts

A university claims that the mean time professors are in their offices for students is at least 6.5 hours each week. A random sample of eight professors finds that the mean time in their offices is 6.2 hours each week. With a sample standard deviation of 0.49 hours from a normally distributed data set, can the university's claim be supported at =0.05?

Homework Help:

6VE. Second sample hypothesis testing from word problem to implications for claim, with test statistic

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(3:26)

6VF. Third sample hypothesis testing from word problem to implications for claim, with t distribution, test statistic and p-value

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(4:03)

6DE. When to use z and when to use t distribution

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(DOCX)

Group of answer choices

No, since the test statistic is not in the rejection region defined by the critical value, the null is rejected. The claim is the null, so is not supported

Yes, since the test statistic is not in the rejection region defined by the critical value, the null is not rejected. The claim is the null, so is supported

No, since the test statistic is in the rejection region defined by the critical value, the null is rejected. The claim is the null, so is not supported

Yes, since the test statistic is in the rejection region defined by the critical value, the null is not rejected. The claim is the null, so is supported

Flag question: Question 14

Question 14

2pts

A credit reporting agency claims that the mean credit card debt in a town is greater than $3500. A random sample of the credit card debt of 20 residents in that town has a mean credit card debt of $3547 and a standard deviation of $391. At =0.10, can the credit agency's claim be supported, assuming this is a normally distributed data set?

Homework Help:

6VD. Sample hypothesis testing from word problem to implications for claim, with p-values

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(3:15)

6VF. Third sample hypothesis testing from word problem to implications for claim, with t distribution, test statistic and p-value

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(4:03)

6DE. When to use z and when to use t distribution

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(DOCX)

Group of answer choices

Yes, since p-value of 0.30 is less than 0.54, reject the null. Claim is alternative, so is supported

Yes, since p-value of 0.30 is greater than 0.10, fail to reject the null. Claim is null, so is supported

No, since p-value of 0.30 is greater than 0.10, fail to reject the null. Claim is alternative, so is not supported

No, since p-value of 0.30 is greater than 0.10, reject the null. Claim is null, so is not supported

Flag question: Question 15

Question 15

2pts

A researcher wants to determine if zinc levels are different between the top of a glass of water and the bottom of a glass of water. Many samples of water are taken. From half, the zinc level at the top is measured and from half, the zinc level at the bottom is measured. Would this be a valid matched pair test?

Homework Help:

6DF. Paired sample experiment structure requirements and assumptions

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(DOCX)

Group of answer choices

Yes, as long as there are an equal number of glasses in each group

Yes, as long as they are all from the same faucet

No, as the zinc levels cannot be accurately measured

No, as the measurements of top and bottom should be from the same glass