The article Gas Cooking, Kitchen Ventilation, andExposure to Combustion Products (Indoor
Chapter 7, Problem 13(choose chapter or problem)
The article Gas Cooking, Kitchen Ventilation, andExposure to Combustion Products (Indoor Air, 2006:6573) reported that for a sample of 50 kitchens with gascooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the samplestandard deviation was 164.43.a. Calculate and interpret a 95% (two-sided) confidenceinterval for true average CO2 level in the population ofall homes from which the sample was selected.b. Suppose the investigators had made a rough guess of 175for the value of s before collecting data. What samplesize would be necessary to obtain an interval width of 50ppm for a confidence level of 95%?
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