A certain publication provides information on new automobile modelsincluding price, mileageratings, enginesize, bodysize, and indicators of features. A simple random sample of 35 new models yielded the accompanying data on fuel tankcapacity, in gallons. Complete parts(a) through(d) below.

a. Determine a point estimate for the mean fuel tank capacity of all new automobile models. Interpret your answer in words.(Note: xi=653.8 gallons.)

A point estimate for the mean fuel tank capacity of all new automobile models is

18.68

18.68 gallon(s). This means that the mean fuel tank capacity of all new automobile models is estimated to be approximately this value, based on the sample data.

(Round to two decimal places asneeded.)

b. Determine a 95% confidence interval for the mean fuel tank capacity of all new automobile models. Assume =3.50.

The 95% confidence interval is from

? to ?

(Round to two decimal places asneeded.)