**Given that in a one-tail test you cannot reject Ho, can you reject Ho**

Question 1

Given that in a one-tail test you cannot reject Ho, can you reject Ho in a two-tail test at the same a?

Answer

Yes

No

Maybe

1 points

Question 2

For a sample size of n = 100 and σ = 10, we want to test the hypothesis H0: μ = 100. The sample mean is 103. The test statistic is

Answer

1.645

1.960

3.000

0.300

1 points

Question 3

Which of the following is incorrect?

Answer

The level of significance is the probability of making a Type I error

Lowering both a and b at once will require higher sample size

The probability of rejecting a true null hypothesis increases as n increases

When Type I error increases, Type II error must decrease, ceteris paribus

1 points

Question 4

In hypothesis testing, Type I error is

Answer

Set at 5 percent

Smaller than or equal to 5 percent

The probability of rejecting H0 when H0 is true

The probability of rejecting H0 when H1 is true

1 points

Question 5

Given a normal distribution with σ = 3, we want to test the hypothesis H0: μ = 20. We find that the sample mean is 21. The test statistic is

Answer

1.000

1.645

1.960

Impossible to find without more information

1 points

Question 6

The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it. A trial sample of 25 employees shows that 16 are dissatisfied. For a right-tailed test, the test statistic would be

Answer

1.227

1.375

1.400

1.115

1 points

Question 7

A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. Find the critical value to test whether the mean transaction time exceeds 60 seconds at a = .01.

Answer

2.947

2.602

2.583

2.333

1 points

Question 8

As you are crossing a field at the farm, your country cousin Jake assures you "Don't worry about that old bull coming toward us. He's harmless." As you consider Jake's hypothesis, what would be Type I error on your part?

Answer

You will soon feel the bull's horns

You will run away for no good reason

Jake will not have any more visits from you

1 points

Question 9

Last year, 10 percent of all teenagers purchased a new iPhone. This year, a sample of 260 randomly chosen teenagers showed that 39 had purchased a new iPhone. To test whether the percent has risen, the p-value is approximately

Answer

.0501

.0314

.0492

.0036

1 points

Question 10

Which statement about a is not correct?

Answer

It is the probability of committing a Type I error

It is the test's significance level

It is the probability of rejecting a true H0

It is equal to 1-b

Given that in a one-tail test you cannot reject Ho, can you reject Ho in a two-tail test at the same a?

Answer

Yes

No

Maybe

1 points

Question 2

For a sample size of n = 100 and σ = 10, we want to test the hypothesis H0: μ = 100. The sample mean is 103. The test statistic is

Answer

1.645

1.960

3.000

0.300

1 points

Question 3

Which of the following is incorrect?

Answer

The level of significance is the probability of making a Type I error

Lowering both a and b at once will require higher sample size

The probability of rejecting a true null hypothesis increases as n increases

When Type I error increases, Type II error must decrease, ceteris paribus

1 points

Question 4

In hypothesis testing, Type I error is

Answer

Set at 5 percent

Smaller than or equal to 5 percent

The probability of rejecting H0 when H0 is true

The probability of rejecting H0 when H1 is true

1 points

Question 5

Given a normal distribution with σ = 3, we want to test the hypothesis H0: μ = 20. We find that the sample mean is 21. The test statistic is

Answer

1.000

1.645

1.960

Impossible to find without more information

1 points

Question 6

The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it. A trial sample of 25 employees shows that 16 are dissatisfied. For a right-tailed test, the test statistic would be

Answer

1.227

1.375

1.400

1.115

1 points

Question 7

A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. Find the critical value to test whether the mean transaction time exceeds 60 seconds at a = .01.

Answer

2.947

2.602

2.583

2.333

1 points

Question 8

As you are crossing a field at the farm, your country cousin Jake assures you "Don't worry about that old bull coming toward us. He's harmless." As you consider Jake's hypothesis, what would be Type I error on your part?

Answer

You will soon feel the bull's horns

You will run away for no good reason

Jake will not have any more visits from you

1 points

Question 9

Last year, 10 percent of all teenagers purchased a new iPhone. This year, a sample of 260 randomly chosen teenagers showed that 39 had purchased a new iPhone. To test whether the percent has risen, the p-value is approximately

Answer

.0501

.0314

.0492

.0036

1 points

Question 10

Which statement about a is not correct?

Answer

It is the probability of committing a Type I error

It is the test's significance level

It is the probability of rejecting a true H0

It is equal to 1-b

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