Question

A study was conducted to determine if 2 types of car batteries lasted the same amount of time. A sample of 50 brand x batteries lasted and average of 3.5 years, with a standard deviation of 1.0 years. A sample of 40 brand y batteries lasted 3.2 years with a standard deviation of 1.5 years. Test at the 90% confidence level to determine whether or not the brands last the same amount of time. Use a two tailed test of hypothesis, and the critical value method, do not find the p-value.

properly define x, draw and label the bell curve, and write out a complete sentence stating the conclusion at the end

Answer 1

3.2 ñ - 3.5 Sa=1.0 hy=48 Sy = 15 dt def 2811442) = 82 (comprehensive method (1) Ho: Mally VS Hai Mat My claim) (11) at a = 10x significance level (90% confidence level) 2/2 The (sitical values - 1.664 sy 54. (11) The test statistic t = -lobby talib64 t t (3.5-3.2) =/11160 (loo)? (115) (10) Couchsion : Do not reject to we Can Conchide that brand & and brandy has the same mean time.