Question: Sample size calculation. We wish to detect a mean difference of 0.25 for a variable that has a standard deviation of 0.67. How large a

Sample size calculation. We wish to detect a mean difference of 0.25 for a variable that has a standard deviation of 0.67. How large a sample is needed to detect the mean differences with 90% power at α

= 0.05

(two-sided)?

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We wish to detect a mean difference of 0.25 for a variable that has a standard deviation of 0.67. How large a sample is needed to detect the mean differences with 90% power at = 0.05 (two-sided)?

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