Question 2)

Blood glucose levels for obese patients have a mean of 100 with standard deviation of 15. A researcher thinks that a diet high in raw corn starch will have a positive or negative effect on blood glucose levels. A sample of 31 patients who have tried the raw corn starch diet have a mean glucose level of 140. Test the hypothesis that the raw corn starch had an effect at a significance level of 0.05. Formulate the decision rule and interpret the results.