A manufacturing company claims that the mean lifetime of bulbs produced was at least 160 hours. In a random sample of 100 bulbs produced, the sample mean lifetime of bulbs was 150 hours and the sample standard deviation was 25 hours. (i)Construct a 95% confidence interval for the mean lifetime of bulbs produced. (ii)Construct a 99% confidence interval for the mean lifetime of bulbs produced. (iii)Calculate the width of confidence interval in (a) and (b). Interpret the result.
A manufacturing company claims that the mean lifetime of bulbs produced was at least 160 hours. In a random sample of 100 bulbs produced, the sample mean lifetime of bulbs was 150 hours and the sample standard deviation was 25 hours. (i)Construct a 95% confidence interval for the mean lifetime of bulbs produced. (ii)Construct a 99% confidence interval for the mean lifetime of bulbs produced. (iii)Calculate the width of confidence interval in (a) and (b). Interpret the result.
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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A manufacturing company claims that the
(i)Construct a 95% confidence interval for the mean lifetime of bulbs produced.
(ii)Construct a 99% confidence interval for the mean lifetime of bulbs produced.
(iii)Calculate the width of confidence interval in (a) and (b). Interpret the result.
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