Suppose that in Problem 9.14, the standard deviation is 120 hours. a. Repeat (a) through (d) of
Question:
a. Repeat (a) through (d) of Problem 9.14, assuming a standard deviation of 120 hours.
b. Compare the results of (a) to those of Problem 9.14.
In problem 9.14
a. At the 0.05 level of significance, is there evidence that the mean life is different from 375 hours?
b. Compute the p-value and interpret its meaning.
c. Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
d. Compare the results of (a) and (c). What conclusions do you reach?
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aPHStat output Z Test of Hypothesis for the Mean Data Null Hypothesis m 375 Level of Significance 00...View the full answer
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Related Book For 
Basic Business Statistics Concepts And Applications
ISBN: 9780132168380
12th Edition
Authors: Mark L. Berenson, David M. Levine, Timothy C. Krehbiel
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