An article reported that for a sample of47kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO₂level (ppm) was 654.16, and the sample standard deviation was165.91.

(a) Calculate and interpret a 95% (two-sided) confidence interval for true average CO₂level in the population of all homes from which the sample was selected. (Round your answers to two decimal places.)

\f