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(b) Suppose the investigators ha rough guess of 175 for the value collecting data. What sample siz necessary ppm for a confidence level of 95 to obtain an interval v your answer up to the nearest w number.)

(b) Suppose the investigators ha rough guess of 175 for the value collecting data. What sample siz necessary ppm for a confidence level of 95 to obtain an interval v your answer up to the nearest w number.)

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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An article reported that for a sample of 44 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO, level (ppm) was 654.16, and the sample standard deviation was 166.93. (a) Calculate and interpret a 95% (two-sided) confidence interval for true average Co, level in the population of all homes from which the sample was selected. (Round your answers to two decimal places.) ppm
Transcribed Image Text:An article reported that for a sample of 44 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO, level (ppm) was 654.16, and the sample standard deviation was 166.93. (a) Calculate and interpret a 95% (two-sided) confidence interval for true average Co, level in the population of all homes from which the sample was selected. (Round your answers to two decimal places.) ppm
(b) Suppose the investigators had made a rough guess of 175 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 48 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.)
Transcribed Image Text:(b) Suppose the investigators had made a rough guess of 175 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 48 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.)
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