Suppose, in testing a hypothesis about a mean, the Z test statistic is computed to be 2.04. The null hypothesis should be rejected if the chosen level of significance is 0.01 and a two-tail test is used.
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- 1.Suppose, in testing a hypothesis about a mean, the Z test statistic is computed to be 2.04. The null hypothesis should be rejected if the chosen level of significance is 0.01 and a two-tail test is used.选项： A:正确; B:错误
- 2.A ________ is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis. A: significance level B: critical value C: test statistic D: parameter
- 3.A ________ is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis.选项： A:significance level; B:critical value; C:test statistic; D:parameter
- 4. A is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis. 选项： A: significance level B: critical value C: test statistic D: parameter
- 5.36.A ________ is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis. 选项： A、significance level B、critical value C、test statistic D、parameter
- 6.Which of the following statements is NOT true about the level of significance in a hypothesis test?
- 7.It is possible to directly compare the results of a confidence interval estimate to the results obtained by testing a null hypothesis if 选项： A、a two-tail test for μ is used. B、a one-tail test for μ is used. C、Both of the previous statements are true. D、None of the previous statements is true.
- 8.If a two-tailed hypothesis test has a 5% probability of rejecting the null hypothesis when the null is true, it is most likelythat the: 选项： A: probability of a Type l error is 2.5%. B: power of the test is 95%. C: significance level of the test is 5%.
- 9.The power of the test is:（） A. the probability of rejecting a true null hypothesis. B. equal to the level of significance. C. the probability of rejecting a false null hypothesis.
- 10.17.It is possible to directly compare the results of a confidence interval estimate to the results obtained by testing a null hypothesis if 选项： A、a two-tail test for μ is used. B、a one-tail test for μ is used. C、Both of the previous statements are true. D、None of the previous statements is true.
- 11.Using the confidence interval when conducting a two-tail test for the population mean we do not reject the null hypothesis if the hypothesised value for µ:
- 12.A researcher is testing whether the average age of employees in a large firm is statistically different from 35 years (either above or below.. A sample is drawn of 250 employees and the researcher determines that the appropriate critical value for the test statistic is 1.96. TheValue of the computed test statistic is 4.35. Given this information, which of the following statements is least accurate? The test: 选项： A: has a significance level of 95%. B: indicates that the researcher will reject the null hypothesis. C:Indicates that the researcher is 95% confident that the average employee age i:Different than 35 years.
- 13.Which of the following statements is NOT true about the level of significance in a hypothesis test 选项： A、The larger the level of significance, the more likely you are to reject the null hypothesis. B、The level of significance is the maximum risk we are willing to accept in making a Type I error. C、The significance level is also called the α level. D、The significance level is another name for Type II error.
- 14.A test statistic is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis.A．正确B．错误
- 15.A test statistic is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis.选项： A:对 B:错
- 16.Which of the following statements about hypothesis testing is FALSE（） 选项： A、The null hypothesis is a statement about the value of a population parameter. B、A Type Ⅱ error is failing to reject a false null hypothesis. C、If the alternative hypothesis is Ha: μ＞μ0, a two - tailed test is appropriate.
- 17.If the null hypothesis is rejected in hypothesis testing, __ 选项： A、no conclusions can be drawn from the test. B、the alternative hypothesis is true. C、the data must have been accumulated incorrectly. D、the sample size has been too small.
- 18.An analyst calculates that the mean of a sample of 200 observations is 5. The analyst wantsTo determine whether the calculated mean, which has a standard error of the sample statistic of 1, is significantly different from 7 at the 5% level of significance. Which of the following statements isleast accurate?: 选项： A: The alternative hypothesis would be H: mean>7. B: The null hypothesis would be: Ht: mean = 7.The mean observation is significantly different from 7, because the calculated i C:Statistic is less than the critical Z-statistic.
- 19.A Type 1 error is made when: 选项： A: The null hypothesis is rejected when it shouldn’t be rejected. B: The alternative hypothesis is accepted when it should be rejected. C: The null hypothesis is accepted when it should be rejected.
- 20.An analyst calculates that the mean of a sample of 200 observations is 5. The analyst wantsTo determine whether the calculated mean, which has a standard error of the sample statistic of 1, is significantly different from 7 at the 5% level of significance. Which of the following statements isleast accurate?: 选项： A: The alternative hypothesis would be H: mean>7. B: The null hypothesis would be: Ht: mean = 7.The mean observation is significantly different from 7, because the calculated i C:Statistic is less than the critical Z-statistic.
- 21.While performing a hypothesis test, Albert Khan is told that his analysis suffers from a Type I error. We can thereafter conclude that: 选项： A: Khan rejected the null hypothesis when it was actually false. B: Khan failed to reject the null hypothesis when it was actually false. C: Khan rejected the null hypothesis when it was actually true.
