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yards and σAce = 20 yards. Difference Between 2 Population
estimate DPar–Ace = μPar –
d = x Par - x Ace = 17 σd = 2 s + Par n Par s 2
Ace n Ace = 2.622 z2
α σ2 σ 2
1 d ±z 2
α + n2 σ2 σ 2
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
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 know...
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This document was uploaded on 03/05/2014.
- Spring '13