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Test1a_KEY_Sp11

Test1a_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 1a 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 2 2 2 /2 /2, 1 /2 2 2 /2, 1 1 /2, 1 1 1 ˆ ˆ (1- ) ˆ / n / n n n n n s n s p p x z x t s p z n Single sample tests 0 2 2 0 0 0 0 0 0 2 0 0 0 1 / / (1 ) n S X X X np Z T Z n s n np p Mean and variance 2 2 1 1 1 n n i i i i x x x x s n n
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. (True or False) A type I error can only occur if I fail to reject the null hypothesis. 2. (True or False) Given a test statistic of Z 0 = -2.05, I would reject a two-sided hypothesis if Z 0 > |Z α/2 |. ( NOTE : As many of you indicated, the absolute value on the wrong thing it should have been on Z 0 . As a result, this question was confusing. Everyone was given full credit for this question.) 3. (True or False) The p-value of Z 0 = -2.05 is less than 0.025, regardless of the number of observations in the sample.

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Test1a_KEY_Sp11 - Name_KEY 9 February 2011 IE330 Spring...

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