The following table shows the rate R of vehicular involvement in traffic accidents (per 100,000,000 vehicle-miles) as a function of vehicular speed s, in miles per hour, for commercial vehicles driving at night on urban streets. Speed s Accident rate R 20 1600 25 650 30 350 35 200 40 650 45 1250 (a) Use regression to find a quadratic model for the data. (Round the regression parameters to two decimal places.) R (b) Calculate R(60). (Round your answer to two decimal places.) R(60) = Explain what your answer means in practical terms. Commercial vehicles driving at night on urban streets at miles per hour have traffic accidents at a rate of per 100,000,000 vehicle miles. (c) At what speed is vehicular involvement in traffic accidents (for commercial vehicles driving at night on urban streets) at a minimum? (Round your answer to the nearest whole number.) mph

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The following table shows the rate R of vehicular involvement in traffic accidents (per 100,000,000 vehicle-miles) as a function of
vehicular speed s, in miles per hour, for commercial vehicles driving at night on urban streets.
Speed s
Accident rate R
20
1600
25
650
30
350
35
200
40
650
45
1250
(a) Use regression to find a quadratic model for the data. (Round the regression parameters to two decimal places.)
R
(b) Calculate R(60). (Round your answer to two decimal places.)
R(60) =
Explain what your answer means in practical terms.
Commercial vehicles driving at night on urban streets at
miles per hour have traffic accidents at a
rate of
per 100,000,000 vehicle miles.
(c) At what speed is vehicular involvement in traffic accidents (for commercial vehicles driving at night on urban streets)
at a minimum? (Round your answer to the nearest whole number.)
mph
Transcribed Image Text:The following table shows the rate R of vehicular involvement in traffic accidents (per 100,000,000 vehicle-miles) as a function of vehicular speed s, in miles per hour, for commercial vehicles driving at night on urban streets. Speed s Accident rate R 20 1600 25 650 30 350 35 200 40 650 45 1250 (a) Use regression to find a quadratic model for the data. (Round the regression parameters to two decimal places.) R (b) Calculate R(60). (Round your answer to two decimal places.) R(60) = Explain what your answer means in practical terms. Commercial vehicles driving at night on urban streets at miles per hour have traffic accidents at a rate of per 100,000,000 vehicle miles. (c) At what speed is vehicular involvement in traffic accidents (for commercial vehicles driving at night on urban streets) at a minimum? (Round your answer to the nearest whole number.) mph
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