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Question: a simple random sample of 20 new automobile models yielded...

Question details
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.)

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