hw4 - ME365 PROBLEM SET 4 Fall 2012 Due Thursday 2/9 Use a...

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ME365 PROBLEM SET 4 Fall 2012 Due: Thursday, 2/9 Use a separate sheet to answer each problem. Also write your own name, your lecturer's name and problem number on each sheet you hand in. Problem No. 1: (a) A manufacturer of VCR systems would like to estimate the mean failure time of a VCR brand with 95% confidence. Six systems are tested to failure, and the following data (in hours of playing time) are obtained: 1250, 1320, 1542, 1464, 1275, and 1383. Estimate the population mean and the 95% confidence interval on the mean. (This a small number of data points so you will want to use the Student’s t function for these estimates). (b) To reduce the 95% confidence interval to ± 50 hours, the VCR manufacturer decides to test more systems to failure. Determine how many more systems should be tested. (If this is a small number you may need to iterate with the Student’s t function to arrive at you answer). Problem No. 2:
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This note was uploaded on 02/22/2012 for the course ME 365 taught by Professor Merkle during the Spring '07 term at Purdue.

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hw4 - ME365 PROBLEM SET 4 Fall 2012 Due Thursday 2/9 Use a...

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