Quiz3a_KEY_Sp11

Quiz3a_KEY_Sp11 - A Name: _KEY_ 18 February 2011 IE330...

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Name: ______________KEY____________________ A 1 18 February 2011 IE330 Spring 2011 Quiz #3a 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____________________ A 2
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Name: ______________KEY____________________ A 4 1. (TRUE or FALSE) Pooled standard deviation is used whenever the number of observations in each sample is the same. 2. (TRUE or FALSE) It is possible for a two-sample t-test to come to a different conclusion than a paired t-test. 3. (TRUE or FALSE) If our null hypothesis is H 0 : σ 1 = σ 2 , then a statistical test of this hypothesis involves calculating a test statistic and comparing it against critical values from an F distribution . 4. Which of the following is true about two-sample tests of mean? (Select all that are true.) a. Whenever the sample variance is small, a paired t-test should be run.
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Quiz3a_KEY_Sp11 - A Name: _KEY_ 18 February 2011 IE330...

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