Q. 12

A statistics teacher claims that, on the average, 15% of her students get a grade of A, 25% get a B, 10% get a C, 15% get a D, 35% and get an F. The grades of a random sample of 110 students were recorded. The following table presents the results. Test the hypothesis that the grades follow the distribution claimed by the teacher. Use the 0.05 level of significance and the P-value method with the TI-Plus calculator.

Grade A B C D F

Observed 5 32 15 23 35

Part 2 of 5

(b) State the null and alternate hypotheses.

H0: p1 = 0.15, p2 = , p3 = 0.1, p4 = 0.15, p5 = .

H1 : Some or all the actual probabilites (differ) from those specified by H0.