Question: Two students are asking to construct a confidence interval estimate of the mean (test score of a midterm exam from a lager class) Both student decide to use the same confidence level thus using ( a z of 1.96) but Dave decides to use a sample of 40 student while Pat uses a sample of 25 students. How would their confidence intervals differ?

a) Dave’s interval would have a greater degree of confidence

b) Pat’s interval would have a greater degree of confidence

c) Dave’s interval would be narrower

d) Dave’s interval would be wider