Power of a two-tailed test of a correlation coefficient
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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Weekly samples of wet acid deposition were collected for a 1-month period. Calculate the average pH and determine how many more times acidic the average sample is than a theoretical clear air sample with pH=5.65. Measured pH values were 3.3, 4.2,
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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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There are three candidates for a position. The candidates are interviewed independently by each member of a three person committee. A candidate will be hired if she is ranked first by at least two members of the committee.
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