An article reported that for a sample of 45 kitchens with gas cooking appliances monitored during a one-week period, the sample mean Co, level (ppm) was 654.16, and the sample standard deviation was 165.23. (a) Calculate and interpret a 95% (two-sided) confidence interval for true average co, 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. O we are 95% confident that this interval does not contain the true population mean. O we are 95% confident that the true population mean lies above this interval. • we are 95% confident that this interval contains the true population mean. (b) Suppose the investigators had made a rough guess of 177 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 52 ppm for a confidence level of 95%? (Round your answer up to the near number.) kitchens

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.