An article reported that for a sample of 50 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 165.06. (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.) 608.4 699.9 ) P 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 above this interval. We are 95% confident that the true population mean lies below this interval. (b) Suppose the investigators had made a rough guess of 174 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 A state legislator wishes to survey residents of her district to see what proportion of the electorate is aware of her position on using state funds to pay for abortions. (Round your answers up to the nearest integer.) I USE SALT (a) What sample size is necessary if the 95% CI for p is to have a width of at most 0.16 irrespective of p? 147 people (b) If the legislator has strong reason to believe that at least of the electorate know of her position, how large a sample size would you recommend to maintain a width of at most 0.16? 147 people