The life in hours of a 75-watt light bulb is known to be normally distributed with o = 25 hours. A random sample of 19 bulbs has a mean life of = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. Round your answers to the nearest integer (e.g. 9876). i (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). Round your answer to the nearest integer (e.g. 9876).
The life in hours of a 75-watt light bulb is known to be normally distributed with o = 25 hours. A random sample of 19 bulbs has a mean life of = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. Round your answers to the nearest integer (e.g. 9876). i (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). Round your answer to the nearest integer (e.g. 9876).
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Transcribed Image Text:The life in hours of a 75-watt light bulb is known to be normally distributed with o = 25 hours. A random sample of 19 bulbs has a
mean life of I = 1014 hours.
(a) Construct a 95% two-sided confidence interval on the mean life.
Round your answers to the nearest integer (e.g. 9876).
i
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(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).
Round your answer to the nearest integer (e.g. 9876).
i
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