Dif in Means -- Known Sigmas - DIFFERENCE IN POPULATION...

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DIFFERENCE IN POPULATION MEANS WITH KNOWN VARIANCES Test: H 0 : μ 1 - μ 2 = 5 H 1 : μ 1 - μ 2 > 5 Known: σ 1 = 10 and σ 2 = 15; n 1 = 100 and n 2 = 75 (Data in A2:A101 and B2:B76) Go to Tools Select Data Analysis Select z-Test: Two Sample for Means Hypothesized Mean Difference: H 1 : μ 1 - μ 2 > 5 Variances, NOT St’d Dev.’s (10) 2 = 100 (15) 2 = 225
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2 2 2 1 2 1 025 . 2 1 ) ( n n z x x σ + - - CONFIDENCE INTERVAL FOR : μ 1 - μ 2 The lower confidence limit (LCL) for the 95% interval is: The upper confidence limit (UCL) for the 95% interval is The same except the “-“ sign is replaced with a “+” sign.
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This note was uploaded on 08/29/2011 for the course STATISTICS 361 taught by Professor Gupta during the Spring '11 term at California State University , Monterey Bay.

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Dif in Means -- Known Sigmas - DIFFERENCE IN POPULATION...

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