8-14. The life in hours of a 75-watt light bulb is known to be normally distributed with o = 25 hours. A random sample of 20 bulbs has a mean life of x = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. (b) Construct a 95% lower-confidence bound on the mean life. Compare the lower bound of this confidence interval with the one in part (a).

8-14. The life in hours of a 75-watt light bulb is known to be normally distributed with o = 25 hours. A random sample of 20 bulbs has a mean life of x = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. (b) Construct a 95% lower-confidence bound on the mean life. Compare the lower bound of this confidence interval with the one in part (a).

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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(only if possible, preferably in minitab, but you can do it manully)

8-14. The life in hours of a 75-watt light bulb is known to be
normally distributed with o = 25 hours. A random sample of 20
bulbs has a mean life of x = 1014 hours.
(a) Construct a 95% two-sided confidence interval on the
mean life.
(b) Construct a 95% lower-confidence bound on the mean life.
Compare the lower bound of this confidence interval with
the one in part (a).

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