(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.) ppm Interpret the resulting interval. O 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. O We are 95% confident that this interval contains the true population mean. O We are 95% confident that this interval does not contain the true population mean. X (b) Suppose the investigators had made a rough guess of 171 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 44 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.)

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