Test1c_KEY_Sp11

# Test1c_KEY_Sp11 - Name: _KEY_ 9 February 2011 IE330 Spring...

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Name: _______________KEY________________________ 1 of 10 9 February 2011 IE330 Spring 2011 Test 1c No calculators, closed book, closed notes. Do not tear off any pages. Once you are finished, turn in the test and leave quietly.

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Name: _______________KEY________________________ 2 of 10 Confidence intervals 22 2 /2 /2, 1 1 1 1 11 ˆˆ (1- ) ˆ / n n nn n s n s pp x z x t s p z n Single sample tests 0 2 2 0 0 0 0 0 0 2 0 00 1 / / (1 ) nS X X X np Z T Z n s n np p Mean and variance 2 1 ii x x x xs
Name: _______________KEY________________________ 3 of 10 1 – 8 worth 6 points each, except 3, which was worth 4 points; 9 and 10 worth 28 points each 1. Suppose a 90% confidence interval on a mean is [103.5, 143.5]. Which of the following are true (choose all that are correct)? a. A 95% confidence interval would contain 103.5. b. We cannot determine the population mean from the information given. c. H0: = 140 vs. H1: ≠ 140 would be rejected at α = 0.05. d. H0: = 140 vs. H1: < 140 would be rejected at α = 0.05. e. None of the above is true. 2. (True or False) Having a higher sample standard deviation will increase the test statistic Z 0 , all else being equal. 3. Suppose we conduct a hypothesis test on a mean, and the test statistic Z 0 is found to be 2.01. For which of the following hypotheses is the conclusion correct (choose all that are correct)?

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Test1c_KEY_Sp11 - Name: _KEY_ 9 February 2011 IE330 Spring...

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