# Dependent Sample T-test: 2-tailed

Large Effect Size

Power analysis for a dependent sample t-test was conducted in G*Power to determine a sufficient sample size using an alpha of 0.05, a power of 0.80, a large effect size (dz = 0.8), and two tails (Faul et al., 2013). Based on the aforementioned assumptions, the desired sample size is 15.

Medium Effect Size

Power analysis for a dependent sample t-test was conducted in G*Power to determine a sufficient sample size using an alpha of 0.05, a power of 0.80, a medium effect size (dz = 0.5), and two tails (Faul et al., 2013). Based on the aforementioned assumptions, the desired sample size is 34.

Small Effect Size

Power analysis for a dependent sample t-test was conducted in G*Power to determine a sufficient sample size using an alpha of 0.05, a power of 0.80, a small effect size (dz = 0.2), and two tails (Faul et al., 2013). Based on the aforementioned assumptions, the desired sample size is 199.

References