10.1 Mean sd Known

# 622 s 2 2 par n par d z 2 s 2 ace n ace 5139 2

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Unformatted text preview: a the 2 golf balls yardsetweensample of 80 balls, the Aceis between 11.86 and balls averaged 258 yards. Based on data from previous driving distance 22.14 yards. 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? Difference Between 2 Population Par, Inc. is a manufacturer of golf Means equipment and has developed a new golf ball that has been designed to DPar–Ace = μPar – parameter μAce provide “extra distance.” Par would like to demonstrate that their new Par golf point d = x Par - x Ace = 17 balls are superior to the comparable estimator s s ball made by t...
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## This document was uploaded on 03/05/2014.

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