10.1 Mean sd Known

# 139 2 2 1 2 n 1 n 2 example given these samples what

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Unformatted text preview: 11 and in aPar - Ace £ 22.139 Ace balls averaged 258 yards. Based on data from previous driving distance tests, the two population standard deviations are known with σPar = 15 yards and σAce = 20 yards. Difference Between 2 Population Means parameter DPar–Ace = μPar – μAce point estimator d = x Par - x Ace = 17 σd = standard error margin of za error interval estimate 2 s + Par n Par s 2 Ace n Ace = 2.622 s 2 2 Par n Par + d ±z 2 α s 2 Ace n Ace = 5.139 σ2 σ 2 1 2 n 1 + n 2 Example Given these samples, what is the 95% confidence interval estimate for the difference between the 2 population means? Hypothesis Tests Par, Inc. is a manufacturer of golf equipment and has developed a new golf ball that has been designed to provide “extra distance.” Par would like to demonstrate that their new Par golf balls are superior to the comparable ball made by their competitor, Ace, Inc. In a test of driving distance using a We are 95% confident mechanical driving device, a sample of Par tgolf balls was compared in a hat the difference with sample of Ace golf balls. In a sample of mean driving distances 120 balls, the Par balls averaged 275 b and in...
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