Suppose indoor air quality monitoring results, for a sample of 60 kitchens with natural gas cooking appliances, show a sample mean C02 concentration of 564.2 ppm and a sample standard deviation of 180.9 ppm- a.) Compute a 95% condence interval for the mean C02 concentration in the population of all homes from which the sample was selected. (Give decimal answer to one place past decimal.)Lower bound: i'i'e' Tries 0/5 b.) What sample size would be necessary to obtain a 95% CI interval width of 50 ppm, if the population standard deviation is estimated to be 175 ppm, before collecting the data ? (Give answer as a whole number.) Eif Tries 0/5