Braking, test 2. For another test of the tires in Exercise 29, the company tried them on 10 different cars, recording the stopping distance for each car on both wet and dry pavement.
a) Write a 95% confidence interval for the mean dry pavement stopping distance. Be sure to check the appropriate assumptions and conditions, and explain what your interval means.
b) Write a 95% confidence interval for the mean increase in stopping distance on wet pavement. Be sure to check the appropriate assumptions and conditions, and explain what your interval means.