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Unformatted text preview: Chapter 10 Comparison involving means (independent twosample, known sigma.) Situation: There are two unknown population means μ 1 and μ 2 . We have information on two samples coming from these two populations, and we know the sample means 1 x and 2 x , the population standard deviations σ 1 and σ 2 , and the sample sizes n 1 and n 2 . Then, we do a z test for two means. Example: As part of a study to evaluate differences in education quality between two training centers, a standardized examination is given to individuals who are trained t the centers. Independent samples of 30 individuals from training center A and 40 individuals from training center B are taken. Suppose the population standard derivation for exam stores for both centers is 10. Do the data suggest a significant difference between the population means at the two training center? Training Center A: 1 x =82, and n 1 = 30....
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 Spring '08
 Zhang
 Standard Deviation, Training Center, population standard derivation, Texgas

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