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Question 13

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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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