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Data are gathered on each car in the motor pool, regarding number of miles (in thousand...

Data are gathered on each car in the motor pool, regarding number of miles (in thousand miles) driven in a given year, and maintenance costs (in thousand dollars) for that year:

Part of the linear regression analysis output are shown in below:

Car Number

1

2

3

4

5

Miles Driven (x)

80

29

53

13

15

Repair Costs (y)

3.2

2.15

2.65

2.2

2.325

  1. Construct a 95% confidence interval for the conditional mean of y given x0=50.

    (A) [2.476, 2.879]   (B) [1.538, 2.409] (C) [1.651, 2.30] (D) [2.410, 2.908]

  1. Construct a 95% prediction interval at x0=50.

(A) [2.360, 2.996]

(B) [2.064, 3.254]

(C) [1.612, 2.335]

(D) [2.223, 3.132]

Solutions

Expert Solution

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milcah answered 1 year ago
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