10. Mail carriers of a large city are divided into four groups, according to gender (male or female) and according to whether they walk or ride on their routes. Two groups are selected at random and all the mail carriers are then sampled from each of the two groups and interviewed to determine whether they have been bitten by a dog in the last year. Classify the sampling method as random (simple random), systematic, stratied, or cluster. (a) Random (c) Stratied (e) None of these (b) Systematic (d) Cluster Which of the following r-values does not represent a valid correlation coefcient? (a) r : 1.000 (c) r : -0.247 (e) r : -1.00 (b) r = 1.887 (d) 1- = 0.023 The mean rate for cable television from a sample of households was $29.50 per month, with a standard deviation of $2.75 per month. Using the 68-95 -99.7% Rule, estimate the percent of cable television rates above $35.00 (Assume that the data has a bell-shaped distribution.) (a) 5% (c) 2.5% (e) 97.5% (b) 81.5% (d) 95% 11. As Dave is trying to decide what to wear, he can choose om 8 shirts, 7 shorts, and 4 pairs of ip ops. Assuming everything coordinates, how many different outfits does he have? (a) 144 (c) 240 (e) 224 (b) 19 (d) 300