Summer1Exam1VerA

Summer1Exam1VerA - COURSE MSCI 3710 Exam 1 Version A Summer...

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Use the paragraph below to answer the 5 questions that follow (Kvanli Chapter 8). The life span of an electronic chip used in a high-powered microcomputer is estimated to be 712.35 hours from a random sample of 40 chips. Historically, the life span of these electronic chips is known to be normally distributed with a population mean of 720 hours and variance of 400 hours 2 . Is there evidence that currently, the true mean life of the electronic chips differs from the usual 720 hours? Use a 10% significance level. 1. What are the null hypothesis and alternative hypothesis for this test? A. Ho: a = 712.35 Ha: a a712.35 B. Ho: a a 712.35 Ha: a < 712.35 C. Ho: a = 720 Ha: a a 720 * D. Ho: a > 720 Ha: a aa 720 E. Ho: a = 720 Ha: a <720 2. What is the calculated value of the test statistic? A. – 2.00 B. 0.12 C. 2.17 D. – 2.42 * E. – 0.765 3. If the computed value of the test statistic is 2.17, what is the p-value? A.
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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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Summer1Exam1VerA - COURSE MSCI 3710 Exam 1 Version A Summer...

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