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Unformatted text preview: Statistics 400 Comparing Two Means and Two Variances Two Sample Problems: • Compare the responses in two groups • Each group is an individual sample from a distinct population • The responses from either group are independent of each other When a twosample problem arises TwoSample Comparison of means A group of individuals is divided into two different experimental groups Each group has DIFFERENT individuals, DIFFERENT treatments • Treatment vs. Control groups • Male vs. Female We are going to learn how to study/analyze/draw conclusions about differences between these groups/treatments/individuals. Ping Ma Lecture 35 Fall 2005 1  TwoSample Comparison of Means: • To determine if there exists a difference between two different samples taken from the same population • Responses from each sample are independent of each other SetUp Population Mean Standard Deviatio n 1 1 μ 1 σ Two 2 μ 2 σ Goal: To determine whether Ho: 1 μ = 2 μ Ha: 1 μ > 2 μ Ha: 1 μ ≠...
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 Fall '05
 TBA
 Statistics, Variance, Statistical hypothesis testing, Ma Lecture

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