The following data show the number of hours spent watching television for 12 randomly selected freshmen attending a liberal arts college in the Midwest:

Hours of Television Viewed Weekly 7.5 11.5 14.4 7.8 13.0 10.3 5.4 12.0 12.2 8.9 8.5 6.6 Calculate the range, variance, standard deviation, and interquartile range for the sample data.