Problem 4: A study wants to investigate whether there is a difference in the efficacy of a name brand versus generic brand topical ointment. Both the name brand and generic ointment were applied to the arms of the same 9 subjects. The amounts absorbed were measured and are given. (Solve in MATLAB and by hand) a) Load the data through a file in MATLAB. b) Can you conclude that the mean amounts absorbed is different for the name brand versus the generic? Conduct statistical test of hypothesis with appropriate null and alternate hypothesis using =0.01 and state your conclusion. c) Determine the range of p-values and interpolate to calculate the actual p-value. Howrtworis d) Also determine the 99% confidence interval. Does the confidence interval support your conclusion in part b