A test is made of H0: =μ20 versus H1: >μ20. A sample of size =n53 is drawn, and =x22. The population standard deviation is =σ5.   (a) Compute the value of the test statistic z. (b) Is H0 rejected at the=α0.05 level? (c) Is H0 rejected at the =α0.10 level?

Definition Definition Number of subjects or observations included in a study. A large sample size typically provides more reliable results and better representation of the population. As sample size and width of confidence interval are inversely related, if the sample size is increased, the width of the confidence interval decreases.