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. O 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 number.) confidence level of 95%? (Round your answer up to the nearest whol 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.