leiyou

 

Which of the following most accurately describes the appropriate test structure?

A) F-test.

B) One-tailed test.

C) Two-tailed test.

D) Chi-square test.

leiyou

 

The correct answer is B

The alternative hypothesis, Ha: μ > $145,000, only allows for values greater than the hypothesized value. Thus, this is a one-sided (one-tailed) test.

leiyou

 

The critical value of the z-statistic is:

A) z = ±1.96.

B) z = –2.33.

C) z = +2.33.

D) z = ±2.33.

leiyou

 

The correct answer is C

For a one-tailed z-test at the 1% level of significance, the critical z-value is z0.01 = 2.33. Since the test is one-tailed on the upper end (i.e., Ha: μ > 145,000), we use a positive z-critical value

leiyou

 

At a 1 percent level of significance, Roberts should:

A) fail to reject the null hypothesis.

B) accept the null hypothesis.

C) reject the null hypothesis.

D) neither reject nor fail to reject the null hypothesis.

leiyou

 

The correct answer is A

The decision rule is: reject H0 if z-computed > z-critical. Since 1.1875 < 2.33, Roberts will fail to reject the null.

leiyou

 

The correct answer is A

The decision rule is: reject H0 if z-computed > z-critical. Since 1.1875 < 2.33, Roberts will fail to reject the null.

leiyou

 

7、Which of the following statements is FALSE?

A) A Type I error is rejecting the null when it is actually true.

B) If a person is presumed innocent unless proven otherwise, finding a guilty person innocent is an example of a Type I error.

C) Failing to reject the null when it is false is an example of a Type II error.

D) The probability of committing a Type I error is the significance level of the test.

leiyou

 

The correct answer is B

This is a Type II error. The null hypothesis is that the defendant is innocent which is not rejected when it should have been.

leiyou

 

8、A Type I error occurs when the null hypothesis:

A) is rejected when it is true.

B) fails to be rejected when it is false.

C) is rejected when it is false.

D) fails to be rejected when it is true.