Chapter_10_Discussion - Chapter 10 Doug Bujakowski...

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Chapter 10 Doug Bujakowski
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Two-sample test decision tree μ Independent Populations σ 2 known Use Z-test σ 2 unknown Use separate variance t-test Use pooled variance t-test Related Populations Use paired t-test π Use Z-test for proportions σ 2 Use F-test What’s in our hypothesis? Paired or matched samples Repeated measures (before/after) Sample variances are reasonably close (larger one is not more than 3x the size of the smaller one)
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A marketing consultant is testing the effectiveness of two promotions. She mails promotion A to approximately 87,000 households in Brown county (home of Green Bay). She mails Promotion B to approximately 175,000 households in Dane county. She then records the number of responses to each of the two promotions. Promotion A Promotion B Number of households in the sample 87,000 175,000 Number of responses 6,500 4,000 Usual response rate for this type of promotion 7% 2%
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Chapter_10_Discussion - Chapter 10 Doug Bujakowski...

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