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Exercise

Pearson sample size

Prior to running an analysis, the minimum sample size needed to attempt to achieve the results desired.

A company is interested in running a correlation on the data collected from users on their website. To ensure an appropriate amount of data is collected, determine the minimum number of subjects needed for the results that are of interest.

Instructions

100 XP
  • Load the pwr package.
  • Derive the sample size needed to detect an effect of 0.8 and a power of 0.95 using an alpha of 0.05 by running pwr.r.test().