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4.44 (a) Write down the expression for n to solve Prob. 4.43. (b) What is the size of the total confidence interval in Prob. 4.43? (c) What would have happened in Prob. 4.43 if n < 30? Ans. (a) n = [zo/(x-μ)² (b) 20 operating hours (c) n would have had to be increased to 30 to justify the use of the normal distribution

4.44 (a) Write down the expression for n to solve Prob. 4.43. (b) What is the size of the total confidence interval in Prob. 4.43? (c) What would have happened in Prob. 4.43 if n < 30? Ans. (a) n = [zo/(x-μ)² (b) 20 operating hours (c) n would have had to be increased to 30 to justify the use of the normal distribution

A First Course in Probability (10th Edition)
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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Please answer 4.44 letter B only. Thank you!

4.44 (a) Write down the expression for n to solve Prob. 4.43. (b) What is the size of the total confidence interval in Prob. 4.43? (c) What would have happened in Prob. 4.43 if n < 30? Ans. (a) n = [20/(x-μ)² (b) 20 operating hours (c) n would have had to be increased to 30 to justify the use of the normal distribution
Transcribed Image Text:4.44 (a) Write down the expression for n to solve Prob. 4.43. (b) What is the size of the total confidence interval in Prob. 4.43? (c) What would have happened in Prob. 4.43 if n < 30? Ans. (a) n = [20/(x-μ)² (b) 20 operating hours (c) n would have had to be increased to 30 to justify the use of the normal distribution
4.43 A firm wishes to estimate the mean number of operating hours of a particular type of lightbulb within 10 operating hours (plus or minus) and with 95% confidence. On the basis of previous knowledge with this type of lightbulb, the firm knows a = 30 h. How large a sample would the firm take? Ans. 35
Transcribed Image Text:4.43 A firm wishes to estimate the mean number of operating hours of a particular type of lightbulb within 10 operating hours (plus or minus) and with 95% confidence. On the basis of previous knowledge with this type of lightbulb, the firm knows a = 30 h. How large a sample would the firm take? Ans. 35
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