10.1 Mean sd Known

# 05 or pvalue005 h0 1 2 d0 ha 1 2 d0 reject h0 if zstat

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Unformatted text preview: data from previous driving distance tests, the two population standard deviations are known with σPar = 15 yards and σAce = 20 yards. test statistic upper tail test lower tail test twotailed test Difference Between 2 Population Means (x1 − x2)− D0 zSTAT = 2 2 σ 1 + σ2 n1 n2 H0: DPar–Ace ≤ 0 Ha: DPar–Ace &gt; 0 reject H0 if zSTAT &gt; z.05 or pvalue&lt;0.05 H0: μ1 – μ2 ≥ D0 Ha: μ1 – μ2 &lt; D0 reject H0 if zSTAT &lt; zα or p-value&lt;α H0: μ1 – μ2 = D0 Ha: μ1 – μ2 ≠ D0 reject H0 if zSTAT &lt; –zα/2 or zSTAT &gt; zα/2 or if p-value&lt;α Example zSTAT = What is the value of the test statistic zSTAT ? ( x1 - x 2 ) - D0 Par, Inc. sis + snmanufacturer of golf a n equipment and has developed a new ( x Par - x Ace ) - D0 golf ball thats hass been designed to = +n n provide “extra distance.” Par would like to demonstrate that0 their new Par golf (275 - 258) = = 6.484 balls are superior to the comparable 2.622 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...
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## This document was uploaded on 03/05/2014.

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