A student wanted to determine whether the wait time in the drive-through at McDonald€™s differed from that at Wendy€™s. She used a random sample of 30 cars at McDonald€™s and 27 cars at Wendy€™s and obtained these results:

(a) Is the sampling method dependent or independent?
(b) Is there a difference in wait times at each restaurant€™s drive-through? Use the α = 0.1 level of significance.
(c) Draw boxplots of each data set using the same scale. Does this visual evidence support the results obtained in part (b)?

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Wait Time at McDonald's Drive-Through (seconds) 111.84 137.90 121.21 100.04 116.72 81.43 Wait Time at Wendy's Drive-Through (seconds) 204.29 190.91 171.01 270.82 385.90 151.09 191.60 141.78 122.06 140.44 115.66 227.38 126.91 127.35 122.62 126.62 147.28 131.21 195.44 101.03 71.37 131.69 86.31 128.75 246.59 95.09 153.34 100.94 156.34 281.90 187.53 196.84 284.48 123.66 203.62 71.02 199.86 233.65 363.34 174.43 119.61 128.59 110.55 182.54 390.50 386.71 133.56 110.64 183.79 471.62 155.53