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Unformatted text preview: Chapter 10 Hypothesis Testing Problem (independent twosample, unknown sigma.) Situation: There are two unknown population means 1 and 2 . We have information on two samples coming from these two populations, and we know the sample means 1 x and 2 x , the sample standard deviations s 1 and s 2 , and the sample sizes n 1 and n 2 . The sample sizes are small (at least one under 30). Then, we do a t test for two means. Example Checker Cab company is trying to decide which brand of tires to use for the coming year. Based on the price and experience, it has narrowed its choice to two brands: Bellex and Roadmastaer. A recent study examined the durability of the tires by using a machine with a metallic device that wore down the tires. The time it took for the tire to blow out was recorded. 15 samples from each brand were examined for the study. Below are the data from the study: Beltex: 1 x =3.33, s 1 = 0.68, and n 1 = 15....
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 Spring '08
 Zhang

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