Braking test A tire manufacturer tested the braking per-formance of one of its tire models on a test track. The company tried the tires on 10 different cars, recording the stopping distance for each car on both wet and dry pave-ment. Results are shown in the table.a) Write a 95% confidence interval for the mean drypavement stopping distance. Be sure to check theappropriate assumptions and conditions, and explainwhat your interval means.b) Write a 95% confidence interval for the mean increasein stopping distance on wet pavement. Be sure tocheck the appropriate assumptions and conditions, andexplain what your interval means. Stopping Distance (ft)Car # Dry Pavement Wet Pavement1 150 2012 147 2203 136 1924 134 1465 130 1826 134 1737 134 2028 128 1809 136 19210 158 206

College Algebra (MindTap Course List)
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Section8.7: Probability
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Braking test A tire manufacturer tested the braking per-
formance of one of its tire models on a test track. The
company tried the tires on 10 different cars, recording the
stopping distance for each car on both wet and dry pave-
ment. Results are shown in the table.a) Write a 95% confidence interval for the mean dry
pavement stopping distance. Be sure to check the
appropriate assumptions and conditions, and explain
what your interval means.
b) Write a 95% confidence interval for the mean increase
in stopping distance on wet pavement. Be sure to
check the appropriate assumptions and conditions, and
explain what your interval means.
Stopping Distance (ft)
Car # Dry Pavement Wet Pavement
1 150 201
2 147 220
3 136 192
4 134 146
5 130 182
6 134 173
7 134 202
8 128 180
9 136 192
10 158 206
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