Here is a stem-and-leaf display of the escape time data introduced in Exercise 36 of this chapter. a. Determine the value of the fourth spread. b. Are there any outliers in the sample? Any extreme outliers? c. Construct a boxplot and comment on its features. d. By how much could the largest observation, currently 424, be decreased without affecting the value of the fourth spread? Reference exercise- 36 A sample of 26 offshore oil workers took part in a simulated escape exercise, resulting in the accompanying data on time (sec) to complete the escape (“Oxygen Consumption and Ventilation During Escape from an Offshore Platform,” Ergonomics, ?1997: 281–292): a. ?Construct a stem-and-leaf display of the data. How does it suggest that the sample mean and median will compare? b?. ?Calculate the values of the sample mean and median. [?Hint:?x?i? = 9638 ?.] c. ?By how much could the largest time, currently 424, be increased without affecting the value of the sample median? By how much could this value be decreased without affecting the value of the sample median? d.? ?What are the values of and when the observations are reexpressed in minutes?

Answer Step 1 of 4 a)Lower fourth=359 Upper fourth=391.25 Fourth spread=Upper fourth-Lower fourth =391.25-359=32.25