Question: A sample of difference scores from a repeated-measures experiment has a mean of M_D = 5 with a variance of s² = 64.

a. If n = 4, is this sufficient to reject the null hypothesis using a two-tailed test with α = .05?

b. Would reject H₀ if n = 16? Again, assume a two-tailed test with α = .05.

c. Explain how the size of the sample influences the likelihood of finding a significant mean difference.