) A random sample of 40 engineers were selected from among the large number employed by a corporation engaged in seeking new sources of petroleum. The hours worked in a particular week were determined for each engineer selected. These data had a mean of 46 hours and a standard deviation of 3 hours. a) For that particular week, estimate the mean hours worked for all engineers in the corporation, with a 95% confidence coefficient. b)How many engineers should be sampled if it is desired to estimate the mean number of hours worked to within 0.5 hours with a confidence coefficient of 0.95?.
) A random sample of 40 engineers were selected from among the large number employed by a corporation engaged in seeking new sources of petroleum. The hours worked in a particular week were determined for each engineer selected. These data had a mean of 46 hours and a standard deviation of 3 hours. a) For that particular week, estimate the mean hours worked for all engineers in the corporation, with a 95% confidence coefficient. b)How many engineers should be sampled if it is desired to estimate the mean number of hours worked to within 0.5 hours with a confidence coefficient of 0.95?.
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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9.14) A random sample of 40 engineers were selected from among the large number employed by a corporation engaged in seeking new sources of petroleum. The hours worked in a particular week were determined for each engineer selected. These data had a
a) For that particular week, estimate the mean hours worked for all engineers in the corporation, with a 95% confidence coefficient.
b)How many engineers should be sampled if it is desired to estimate the mean number of hours worked to within 0.5 hours with a confidence coefficient of 0.95?.
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