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.
You are planning to assess whether the mean time students spend on social media varies with the technology used for class during COVID. To ensure you obtain enough data for your A/B test, determine the sample size needed to achieve the values you expect.
This exercise is part of the course
A/B Testing in R
Exercise instructions
- Load the
pwrpackage. - Determine the sample size needed with an expected effect size of
0.90and power of0.80with an alpha of0.05for a two-tailed independent t-test.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Load the pwr package
___
# Determine the sample size needed
pwr.t.test(d = ___, power = ___,
sig.level = ___,
type = ___)