Refer to Exhibit 7-3. The test is statistically significant at what level (two-tailed)?
a. .05
c. .001
b. .01
d. It is not significant.
Ques. 2Refer to Exhibit 7-3. The degrees of freedom for the test are the
a. number of rows -1 time the number of columns -1.
b. number of pairs of numbers -1.
c. total number of cases -2.
d. None of these are true.
Ques. 3Refer to Exhibit 7-3. What is the observed value for the chosen statistic?
a. .396
c. 3.269
b. 2.846
d. None of these are true.
Ques. 4Refer to Exhibit 7-3. What is the null hypothesis?
a. mCBT mControl
c. mCBT = mControl
b. mCBT mControl
d. None of these are true.
Ques. 5Refer to Exhibit 7-3. Which test is most appropriate for these data and hypothesis?
a. Chi square
c. Independent t-test
b. Correlated t-test
d. Pearson's
rQues. 6A researcher wants a 90 percent chance of rejecting the null hypothesis at the one-tailed .05 level with an effect size of .15. The sample size needed is about
a. 140.
b. 160.
c. 180.
d. 200.
e. 380
Ques. 7The greatest statistical power occurs when
a. the sample is small and heterogeneity is small.
b. the sample is small and heterogeneity is large.
c. the sample is large and heterogeneity is small.
d. the sample is large and heterogeneity is large.
Ques. 8An administrator will implement a new science curriculum if there is good evidence that it is more effective than the present curriculum. Otherwise he will continue with the present curriculum. The administrator should use a
a. directional test.
c. difference test.
b. non-directional test.
d. non-difference test.
Ques. 9Which one of the following statements is true?
a. Type I errors are inherently more serious than Type II errors.
b. Type II errors are inherently more serious than Type I errors.
c. The relative seriousness of a Type I or a Type II error is a judgment.
d. Typically in behavioral sciences, Type II errors are regarded as more serious.
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