## (Solution document) You are on the market for a new car. You want to check whether there is a significant difference between the fuel economy of mid-size domestic cars...

You are on the market for a new car. You want to check whether there is a significant difference between the fuel economy of mid-size domestic cars and mid-size import cars. You sample 16 domestic car makes and find an average fuel economy of 31.086 MPG with a standard deviation of 3.4657 MPG. For imports, you sample 12 cars and find an average MPG of 29.852 MPG with a standard deviation of 8.7063. Construct a 99% confidence interval for the difference between the true average fuel economies in question. Assume the difference will represent (domestic - import). You can also assume that the standard deviations are statistically the same between the two populations.

Question 7 options:

1)

(-1.151, 3.619)

2)

(-4.909, 7.377)

3)

(-6.68, 9.148)

4)

We only have the sample means, we need to know the population means in order to calculate a confidence interval.

5)

(-5.393, 7.861)

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Question answered on Mar 11, 2020
PRICE: \$20

Solution~000552147484650.zip (18.37 KB)

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