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Exercise

Mann-Whitney U power assessment

A power analysis allows for the likelihood of an error to be determined. Though the appropriate sample can be gathered and a test may be significant, a power analysis is needed to determine the confidence that can be given to the test results. Assess the Mann-Whitney U test power analysis provided for the likelihood of a Type II error in rejecting the null hypothesis, there is no difference in the number of rounds played in the two versions.

Recall the Mann-Whitney U test assessed the median number of rounds subjects played of a video game, detecting a difference in the two version groups.

Instructions

100 XP
  • Determine the probability of a Type II error if the null hypothesis was rejected given a power analysis result of .9947.