A sample of difference scores from a repeatedmeasures experiment has a mean of MD = 4 with a standard deviation of s = 6..

 If n = 4, is this sample sufficient to reject the null hypothesis using a twotailed test with α = .05?
 Would you reject H_{0} if n = 16? Again, assume a twotailed test with α = .05.
 Explain how the size of the sample influences the likelihood of finding a significant mean difference.