10.1 Mean sd Known

# 2par would like s par ace to demonstrate that their

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Unformatted text preview: – μAce d = x Par - x Ace = 17 σ= d z2 α σ2 σ 2 1 2 n 1 + n2 σ2 σ 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 standard error for the difference between the 2 population means? Hypothesis Tests Par, Inc. is a manufacturer of golf s 12 s 2 2 equipment= σ d and has developed a new + n1 been designed to golf ball that has n 2 2 provide “extra sdistance.” 2Par would like s Par = + Ace to demonstrate that their new Par golf n Par n Ace balls are superior to the comparable 2 ball made by their 20 2 = 15 + competitor, Ace, Inc. 120 80 In a test of driving distance using a = 2.622 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 inte...
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## This document was uploaded on 03/05/2014.

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