s2000exam1verd

# s2000exam1verd - COURSE: MSCI 3710 Exam 1 Version D Spring...

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A lumber company is making boards that are specified to be 250 centimeters tall and a population variance of 169 centimeters. If the boards are too long they must be trimmed, and if they are too short they cannot be used. A sample of 35 boards is made, and it is found that they average 246 centimeters. Is there evidence at the 0.01 significance level that the boards are too short or too long? 1. What are the null hypothesis and alternative hypothesis for this test? A. Ho: l = 250 Ha: l <250 B. Ho: l = 250 Ha: l l g 250 * C. Ho: l > 250 Ha: l l l 250 D. Ho: l = 246 Ha: l l 246 E. Ho: l l 246 Ha: l < 246 2. The appropriate test statistic for testing the hypothesis as defined in question #1 is A. t because the sample size is small B. t because the sample standard deviation was calculated C. F because we do not know the equality of the variance D. Z because the population standard deviation is known * E. Z because the sample variance was provided 3. What is the calculated value of the test statistic? A. - 1.82 * B. - 0.14 C. 1.82 D. 2.33 E. - 2.53 4. Assuming the calculated value of the test statistic is -2.00, what are the decision and conclusion of the test? A. Fail to reject the null hypothesis, conclude there is evidence the boards are too long or too short. B. Fail to reject the null hypothesis, conclude there is insufficient evidence the boards
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## This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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s2000exam1verd - COURSE: MSCI 3710 Exam 1 Version D Spring...

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