A detection device is used to monitor the level of carbon monoxide (CO) in the air. The following data, in ppm (parts per million) were collected from a single location inside a recreation facility: 7.28 8.50 5.56 8.18 4.03 6.98 9.13 7.34 5.56 8.69 9.05 7.98 Questions: a) Identify the variable in this data. b) Compute the sample mean, median, and sample standard deviation, rounded to 3 decimal places. c) Are there outliers in this data set? To determine this, first compute the lower and upper outlier boundaries. Include these in answer. Show your work or explain how you obtained the outlier boundaries. d) Compute a 99% confidence interval (use 3 decimal places) for the population mean carbon monoxide level in the air in this location. Write the answer using the format: lower boundary