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An article reported that for a sample of 41 kitchens with gas cooking appliances monitored...

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An article reported that for a sample of 41 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 25 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 601 69 X I 706 63 X ppm Interpret the resulting interval We are 95 confident that this interval contains the true population mean 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 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 40 ppm for a confidence level of 95 Round your answer up to the nearest whole number kitchens

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