Detect a correlation coefficient
What sample size is needed to detect a correlation coefficient as small as 0.50 with a two-tailed test at the 0.05 alpha level with 90% power?
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What is the power of a two-tailed test of a correlation coefficient (Ho: ?=0, Ha: ? ?0) at the 0.05 level if the sample size is 40 and the true correlation is 0.35?
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