The 95 confidence interval for the difference between the


1. The .95 confidence interval for the difference between the means, using Student's t, is (2.2, 20.5). What are the practical concerns with this confidence interval?

2. For the first of two binomial distributions, there are 15 successes among 24 observations. For the second, there are 23 successes among 42 observations. Test H0: p1 = p2 with a Type I error probability of .05.

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Basic Statistics: The 95 confidence interval for the difference between the
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