Traffic accidents: The following table shows the rate R of vehicular involvement in traffic accidents (per 100,000,000 vehicle-miles) as a function of ve-hicular speed s, in miles per hour, for commercial vehicles driving at night on urban streets.
a. Use regression to find a quadratic model for the data.
b. Calculate R(50) and explain what your answer means in practical terms.
c. At what speed is vehicular involvement in traffic accidents (for commercial vehicles driving at night on urban streets) at a minimum?
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