12.28Xr12-28Part of a university professor’s job is topublish his or her research. This task often..

12.28Xr12-28Part of a university professor’s job is topublish his or her research. This task often entailsreading a variety of journal articles to keep up todate. To help determine faculty standards, a deanof a business school surveyed a random sample of12 professors across the country and asked them tocount the number of journal articles they read in atypical month. These data are listed here. Estimatewith90% confidence the mean number of journalarticles read monthly by professors.9 17 4 23 56 30 41 45 21 10 44 20