Question

A large school has nine junior high school classrooms. At the beginning of the school year they assign an equal number of students to each classroom but during the year students transfer in and out and the numbers don't necessarily stay the same. On the first day of February the principal observes that each classroom contains the following number of students. Can she assume that the classrooms still contain about the same number of students? Use alpha=0.10. Classroom Observed A 31 B 33 C 27 D 29 Question 12 4 pts How many students does the principal expect to see in each classroom? Round to two decimal places. Question 13 2 pts What kind of test should the principal perform to check that each classroom has about the same number of students? Chi Squared

Answer 1

From the given data

	Observed	Expected
Class Room	Freq (Oi)	Frequencies(Ei)	(Oi-Ei)^2 /Ei
A	31	30	0.0333
B	33	30	0.3000
C	27	30	0.3000
D	29	30	0.0333
Total:	120	120	0.6667

Question 12: The expect to see in each classroom is 120/4 = 30

Question 13: Correct answer: Option (A) chi-square

Question 14: Critical X^2: 6.251

Question 15: Test Statistic 0.667

Question 16: Correct answer: Option (A)