Exercise

Independent t-test sample size

To ensure a test is useful and likely to report accurate results as determined by an expected power and effect size, a minimum sample size must be collected. Various tests use different functions to derive the sample size needed to be collected.

We are planning to assess whether the mean time students spend on social media varies with the technology used for class during COVID. To ensure we obtain enough data for our A/B test, determine the sample size needed to achieve the values we expect.

Instructions

100 XP

Load the pwr package.
Determine the sample size needed with an expected effect size of 0.90 and power of 0.80 with an alpha of 0.05 for a two-tailed independent t-test.