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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 two-sample problem arises Two-Sample 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 - Two-Sample 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 Set-Up Population Mean Standard Deviatio n 1 1 1 Two 2 2 Goal: To determine whether Ho: 1 = 2 Ha: 1 > 2 Ha: 1...
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