If n=15 average x is 3.15 theta = 0.33  c=80% and zc = 1.28 what is the margin of error 2.) Find the sample size necessary for an 80% confidence level with a maximum error of estimate of E=.08 for the mean of the study. use data from question 1.

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.