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

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Question

Basic Math

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

Part of the linear regression analysis output are shown inbelow:

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 ofy 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]

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