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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

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
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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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