We want to estimate the population mean within 5, with a 99 percent level of confidence. The
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Here is the answer but I can't understand how to determine z value from the areas under the normal cure (appendix section)
5 = z*std deviation / ?(n)
5 = 2.576*15 / ? (n)
n = 59.722
Large a sample is required = 60
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Standard deviation s 15 Error E 5 Alpha a 1099 001 Za2 Z0005 2575 Sam...View the full answer
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Related Book For 
Statistical Reasoning for Everyday Life
ISBN: 978-0321817624
4th edition
Authors: Jeff Bennett, Bill Briggs, Mario F. Triola
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