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As we have noted in previous chapters, even a very small effect can be significant if the if the sample is large enough. For each of the following, determine how large a sample is necessary for the correlation to be significant. Assume a two-tailed test with a = .05. (Note: Because the table does not list every possible df value, you cannot determine every possible sample size. In each case, use the sample size corresponding to the appropriate df value in the table.)
a. A correlation of r = 0.40
b. A correlation of r = 0.30
c. A correlation of r = 0.20
the united way conducted two appeals a and b in atlanta. results of the appeals were- 30000 people were targeted in
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Prior to a statewide senate election, three polls are conducted concerning a particular candidate's popularity. In the first poll, 750 of 1500 voters favor the candidate.
Explain why a confidence interval for a predictor coefficient is equivalent to a 2-tailed test of significance?
Calculating the effectiveness of an educational intervention using a pretest-posttest design. I plan to run an ANCOVA on the scores with the pretest as the covariate. The six subcatagories on the test give the raw score of correct answers out of the ..
The mean top of knee height of a sitting mate is 20.7 in.
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