Question

A simple random sample of 20 new automobile models yielded the data shown to the right on fuel tank​capacity, in gallons.

14.1 16.5 13.4 16.7 13.6 19.6 17.1 16.2 18.8 15.9 17.2 14.1 19.4 20.5 17.5 20.6 19.9 22.9 15.8 21.1

a. Find a point estimate for the mean fuel tank capacity for all new automobile models. left parenthesis Note: Summation from nothing to nothing x Subscript i Baseline equals 350.9 right parenthesisNote: ∑xi=350.9

A point estimate is

nothing

gallons.

​(Type an integer or a decimal. Do not​ round.)

b. Determine a

95.44​%

confidence interval for the mean fuel tank capacity of all new automobile models. Assume

sigmaσequals=3.70

gallons.The

95.44​%

confidence interval is from

nothing

gallons to

nothing

gallons.

​(Do not round until the final answer. Then round to two decimal places as​ needed.)

Answer 1

All calculations made by hand and when necessary i use a acientefic calculator and t-table to see table values