10.1 Mean sd Known

# Par would like 275 258 to demonstrate that their new

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Unformatted text preview: 2 1 2 n 1 d ±z 2 α + n2 σ2 σ 2 1 2 n 1 + n 2 Example Given these samples, what is the point estimate for the difference between the 2 population means (i.e., for DPar–Ace)? Hypothesis Tests Par, Inc. is a- manufacturer of golf d = x1 x 2 equipment and has developed a new = has been golf ball that x Par - x Ace designed to provide “extra distance.” Par would like = 275 - 258 to demonstrate that their new Par golf = 17 balls are superior to the comparable ball made by their competitor, Ace, Inc. In a test of driving distance using a mechanical driving device, a sample of Par golf balls was compared with a sample of Ace golf balls. In a sample of 120 balls, the Par balls averaged 275 yards and in a sample of 80 balls, the 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 point estimator standard error margin of error interval estimate DPar...
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