Question

XIII. (Hint: See 7.1) Consider the following statistics regarding class sizes at two high schools. McClatchy High: n=41, x = 26.43, s=4.02

Grant High: n=61, y = 24.51, s=3.15

a) Use α = 0.05 to test the claim that the mean class size at McClatchy is different than at Grant High School.

b) Construct a 90% Confidence Interval for μ1 – μ2.

XIV. (Hint: See 7.3) Consider the following typing speeds before and after taking a typing class.

After: 44 51 63 42 61 65 44

Before: 37 46 60 41 56 56 32  wpm

a. ConstructaConfidenceIntervalwitha99%ConfidenceLevel.
b. State the meaning of the confidence interval within the context of the problem

XV. (Hint: See 7.5) From your text, page 379, #8. Follow the directions given at the top of the page.

XIII. (Hint: See 7.1) Consider the following statistics regarding class sizes at two high schools. McClatchy High Grant High n=41 n=61 x = 26.43 y = 24.51 s=4.02 s=3.15 a) Use a= 0.05 to test the claim that the mean class size at McClatchy is different than at Grant High School. b) Construct a 90% Confidence Interval for ui - u2. XIV. (Hint: See 7.3) Consider the following typing speeds before and after taking a typing class. Before: 37 46 60 41 56 56 32 wpm After: 44 51 63 42 61 65 44 a. Construct a Confidence Interval with a 99% Confidence Level. b. State the meaning of the confidence interval within the context of the problem XV. (Hint: See 7.5) From your text, page 379, #8. Follow the directions given at the top of the page.

Answer 1

lo.74 3.1) After - before XIV lla) before 37 After 44 46 51 5 3 60 63 ul 42 56 5 61 56. 65 9 yu 12 32 d = nedi CO S = (sdiend) nt S = 3.6968 ¢ S n 2 62 3.2002 3.708 x 3.6968 that the in in the (0.8189 , 11•1811) 6) There 99% probability that diffescence mean typing speed after taking typing class lies interval (0.8189, 11•1840)