Many people think it’s faster to order at the drive-thru than to order inside at fast-food restaurants. To find out, Patrick and William used a random number generator to select 10 times over a 2-week period to visit a local Dunkin’ Donuts restaurant. At each of these times, one boy ordered an iced coffee at the drive-thru and the other ordered an iced coffee at the counter inside. A coin flip determined who went inside and who went to the drive-thru. The table shows the times, in seconds, that it took for each boy to receive his iced coffee after he placed the order.

Do these data provide convincing evidence at the level of a difference in the true mean service time inside and at the drive thru for this Dunkin’ Donuts restaurant?

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Visit Inside time Drive-thru time 1 62 55 63 50 3 325 321 4 105 110 135 124 55 54 7 92 90 8 75 69 9 203 200 10 100 103 2.