A An article reported that for a sample of 57 kitchens with gas cooking appliances monitored during a one-week period, t

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A An Article Reported That For A Sample Of 57 Kitchens With Gas Cooking Appliances Monitored During A One Week Period T 1 (87.92 KiB) Viewed 117 times

A An article reported that for a sample of 57 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 162.34. (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. O We are 95% confident that this interval does not contain the true population mean. O We are 95% confident that this interval contains the true population mean. O 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. (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 47 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.) kitchens