Mathematics, 24.01.2022 03:00, ob3ymysins

In 2006, 95% of new cars in the US came with a spare tire. In 2017, 72% came with a spare tire. Suppose a researcher takes separate random samples of 250 cars made in each year, then looks at the
difference between the sample proportions P2006 - P2017 of cars with spare tires in each sample.
What are the mean and standard deviation of the sampling distribution of P2006 - P2017?

Choose 1

A. mean of P2006-P2017: 57.5

Standard Deviation of P2006-2017: Square root of .95(.05)/250 + .72(.28)/250

B C and D in picture

In 2006, 95% of new cars in the US came with a spare tire. In 2017, 72% came with a spare tire.

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In 2006, 95% of new cars in the US came with a spare tire. In 2017, 72% came with a spare tire. Su...