A multiple choice exam of 10 questions was given to male and female students. The Grade X for each student the number of correctly answered questions. Grades for samples of 5 male and 10 female students were as follows: Grade X No. of Males S 1 1 6 0 7 2 2 No. of Females a.Give 95% Confidence Interval (CI) for the mean males grades? b.Give 95% CI for the standard deviation of the females grades? 8 1 2 9 0 3 2 10 1 0 Mean 7.4 7.3 c.Give 95% Cl for the mean grade difference between male and female students? d. Give 90%Cl for the ratio of grades standard deviations for male and female students? e.Compute the mean grade of all 15 male and female students? Variance 3.3 1.8

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