20. Electric Cars Although there is a big difference in costs between a Tesla S and a Chevrolet Bolt, is there a difference in the range of miles for these vehicles between charges? Suppose that the results of driving tests are as follows

a. Calculate a point estimate for the difference in the average ranges between charges for a Tesla S and a Chevrolet Bolt with a margin of error.

b. Find a 99% confidence interval estimate for the difference in the average ranges between charges for these electric models. Could you conclude that there is a significant difference in the average ranges?

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Standard Sample Car Mean Deviation Size Tesla S Bolt 230.2 14.3 236.8 18.8 440