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autotrader 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. trucks cars vans 12 8 3 8 7 7 9 10 6 11 7 8 the grand mean for these observations is .

Respuesta :

The grand mean for these observations is 8.

What is the grand mean in statistics?

The grand mean, also known as the pooled mean, is the average of the means of several subsamples with the same number of data points.

The given data is:

12, 8, 3, 8, 7, 7, 9, 10, 6, 11, 7, 8.

The sum of all these observations = 12 + 8 + 3 + 8 + 7 + 7 + 9 + 10 + 6 + 11 + 7 + 8 = 96.

A total number of observations = 12.

Grand mean = Sum of all these observations/Total number of observations

                     = 96/12

                     = 8

Hence, the grand mean for these observations is 8.

To learn more about grand mean in statistics, visit:

https://brainly.com/question/4523756

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