An article reported that for a sample of 54 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the sample standard deviation was 166.42. (a) Calculate and interpret a 95% (two-sided) confidence interval for true average CO₂ level in the population of all homes from which the sample was selected. (Round your answers to two decimal places.) ppm Interpret the resulting interval. We are 95% confident that this interval does not contain the true population mean. We are 95% confident that the true population mean lies below this interval. o We are 95% confident that the true population mean lies above this interval. o We are 95% confident that this interval contains the true population mean. (b) Suppose the investigators had made a rough guess of 179 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 54 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.) kitchens
An article reported that for a sample of 54 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the sample standard deviation was 166.42. (a) Calculate and interpret a 95% (two-sided) confidence interval for true average CO₂ level in the population of all homes from which the sample was selected. (Round your answers to two decimal places.) ppm Interpret the resulting interval. We are 95% confident that this interval does not contain the true population mean. We are 95% confident that the true population mean lies below this interval. o We are 95% confident that the true population mean lies above this interval. o We are 95% confident that this interval contains the true population mean. (b) Suppose the investigators had made a rough guess of 179 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 54 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.) kitchens
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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