feedback

(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)

 







About this question:

Pay using PayPal (No PayPal account Required) or your credit card. All your purchases are securely protected by .
SiteLock