# eco5_exam4 - Eco 5 Spring 06 Exam IV Multiple choice...

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Eco 5 Spring 06 Name: Exam # IV Multiple choice questions ( 5 points ) 1. In a two-sample test of means for independent samples, n 1 = 12 and n 2 = 10. How many degrees of freedom are in the test? a . 22 b . 21 c . 20 d . none of the above 2. In the paired t -test, we assume in the null hypothesis that the distribution of the differences between the paired observation has a mean a . equal to 1. b . equal to n - 1. c . equal to 0. d . none of the above 3. For tests of hypothesis for a two-sample means, sample size greater than 30, a one- tailed test (rejection region in the upper tail), using the 0.01 significance level, the critical value is: a . 2.18 b . 2.68 c . 2.33 d . 3.12 4. To determine if a diet supplement is useful for increasing weight, patients are weighed at the start of the program and at the end of the program. This is an example of a(n) a . test of paired differences. b . independent sample. c . one-sample test for means. d . two-sample test for means 5. If we are interested in testing whether the mean of population 1 is significantly larger

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