Interpret the 95% CI.b. What assumption is needed for this CI to be valid?
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 94E
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Question
The NTSB wants to estimate the difference between the average stopping distance for a car traveling 40 MPH on wet versus dry pavement. Ten vehicles were used for the study where each vehicle was driven at 40 MPH and came to a sudden stop on both wet pavement and dry pavement. The stopping distance was measured (feet) for each pavement condition and the data is shown below followed by Minitab output with the CI.
Vehicle 1 2 3 4 5 6 7 8 9 10
Wet 107 101 109 112 105 106 111 108 98 116
Dry 72 69 74 73 72 72 74 74 67 79
Estimation for Paired Difference
StDev | SE Mean | 95% CI for μ_difference |
|
---|---|---|---|
34.700 | 2.452 | 0.775 | (32.946, 36.454) |
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