The government website fuel economy. gov has data on thousands of cars regarding their fuel efficiency. A random sample from this website of SUVs manufactured between 2012 and 2015 gives the following data on the combined (city and highway) miles per gallon (mpg):
26, 23, 21, 23, 19, 29, 15, 26, 19, 26.
a. Construct an appropriate plot (or plots) to check the distributional assumption for computing a t interval for the mean mpg for SUVs. Comment briefly.
b. Find and interpret a 95% confidence interval for the mean mpg for SUVs manufactured between 2012 and 2015.