Quiz3b_KEY_Sp11

Quiz3b_KEY_Sp11 - B Name: _KEY_ 18 February 2011 IE330...

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Name: _____________KEY__________________ B 1 18 February 2011 IE330 Spring 2011 Quiz #3b Test statistics 0 12 2 2 0 0 0 1 2 0 0 0 0 0 2 22 0 00 1 1 2 2 *2 1 2 0 0 1 2 0 0 0 0 1 / / (1 ) 11 2 / 1 1 p D p nS X X X np X X Z T Z Z n s n np p nn n S n S X X D X X T T T S Z Sn ss S 0 ˆˆ 1 PP
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Name: _____________KEY__________________ B 2
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Name: _____________KEY__________________ B 3
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Name: _____________KEY__________________ B 4 1. Which of the following is true about two-sample tests of mean? (Select all that are true.) a. To reject the null hypothesis, the p-value of the test statistic must be less than α/2. b. Whenever the population variances are large, a paired t-test should be run. c. Pooled standard deviation is used whenever the number of observations in each sample is the same. d. None of the above is true. 2. (TRUE or FALSE) A two-sample t-test will result in the same conclusion as a paired t-test as long as the tests are run on the same sample data. 3. (TRUE or FALSE) If our null hypothesis is H 0 : σ 1 = σ 2 , then a statistical test of
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Quiz3b_KEY_Sp11 - B Name: _KEY_ 18 February 2011 IE330...

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