Question

Q: Assistance to understand clearly and solve this example from Probability and Statistical Inference with the steps of the solution to better understand, thanks.

**Please give the step by step with details to completely see how the solution came about, plenty of thanks.

1) To test two methods of instruction, 50 students are selected at random from each of two groups. At the end of the instruction period, each student is assigned a grade (A, B, C, D, or F) by an evaluating team. The data are recorded as following:

Grades

	A	B	C	D	F	Totals
Group I	8	13	16	10	3	50
Group II	6	10	14	14	6	50

Test the null hypothesis H₀ that the two methods of instruction made no difference at the 5% significance level.

Answer 1