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Question 71

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AutoTrader.com would like to test if a difference exists in the age of three different types of vehicles currently on the road: trucks, cars, and vans. The following data represent the age of a random sample of trucks, cars, and vans. AutoTrader.com would like to test if a difference exists in the age of three different types of vehicles currently on the road: trucks, cars, and vans. The following data represent the age of a random sample of trucks, cars, and vans. The grand mean for these observations is ________. A) 7.2 B) 8.0 C) 8.9 D) 9.3 The grand mean for these observations is ________.


A) 7.2
B) 8.0
C) 8.9
D) 9.3

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