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

 

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 value of the calculated test statistic is closest to:

A) z = 0.67.

B) z = 4.00.

C) z = 1.19.

D) z = 8.13.

leiyou

 

The correct answer is C

 

 

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[2008] Topic 6: Statistical Inference: Estimation and Hypothesis Testing 相关习题

2009-6-25 17:28

leiyou

 

6、Austin Roberts wants to test if the mean price of houses in the area is greater than $145,000. A random sample of 36 houses in the area has a mean price of $149,750. The population standard deviation is $24,000, and Roberts wants to conduct hypothesis testing at a 1 percent level of significance.

The appropriate alternative hypothesis is:

A) Ha: μ > $145,000. 

B) Ha: μ &ge $145,000.

C) Ha: μ ± $145,000.

D) Ha: μ < $145,000.

leiyou

 

The correct answer is Afficeffice" />

Ha: μ > $145,000

leiyou

 

The correct answer is A

At α/2 = 0.025, the critical z-values are: ±zα/2 = ±z0.025 = ±1.96.

leiyou

 

Which of the following decisions is the CORRECT decision for this study?

A) Fail to reject the null hypothesis.

B) Reject the null hypothesis.

C) The sample size is too small, so increase the sample size.

D) No decision is possible because the sample standard deviation was not given.