Question: The following data are the oxygen uptakes (in milliliters) during incubation of a random sample of 15 cell suspensions:

14, 14.5, 14.1, 13.2, 11.2, 14, 14.1, 12.2, 11.1, 13.7, 13.2, 16, 12.8, 14.4, 12.9

Assume that the uptakes of the suspensions are normally distributed with variance of 2.25. Test at 2% level of significance (i) by classical method (using critical values) and (ii) by p-value, the hypothesis that the mean uptake is equal to 12.5 millimeters against that it is not.