Exercise 6-19 presented the joint temperatures of the O-rings (°F) for each test firing or actual launch of the space shuttle rocket motor. In that exercise, you were asked to find the sample mean and sample standard deviation of temperature.

(a) Find the median and the upper and lower quartiles of temperature.

(b) Set aside the lowest observation (31°F) and recompute the quantities in part (a). Comment on your fi ndings. How “different” are the other temperatures from this lowest value?

(c) Construct a box plot of the data and comment on the possible presence of outliers.