A group of inexperienced lifters was randomized to either perform Crossfit or Ol

Question

A group of inexperienced lifters was randomized to either perform Crossfit or Olympic lifting workouts for 10 weeks. We then determined whether or not each participant increased their one repetition maximum (1RM) by more or less than 15%. What statistical test should be used to determine if the proportion of participants that increased their 1RM by more than 15% is higher in those performing Crossfit or Olympic lifting?

A: Chi-Square goodness of fit test

B: Paired t-test

C. one sample test of proportions

D. Two-sample test of proportions

Explanation / Answer

D. Two-sample test of proportions

Test statistic. The test statistic is a z-score (z) defined by the following equation. where P is the hypothesized value of population proportion in the null hypothesis, p is the sample proportion, and is the standard deviation of the sampling distribution. P-value.

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