A safety researcher has measured the speed of automobiles passing his vantage point near an interstate highway. He has also recorded the number of occupants and whether the driver was wearing a seat belt. The data are shown in the following table with seat belt users coded as 1, nonusers as 0. Using a computer statistical package, carry out a multiple regression analysis on these data, interpret the partial regression coefficients, and discuss the results of each significance test.

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y speed (mph 6 63 55 59 59 52 61 Xt occupants. x2- belt usage 2 1 1 1 0 01 0 y speed (mph) 51 57 55 54 49 61 73 x occupants. Xy=beltusage: 1110110 2 2 2 3 1 1 1 1 0 10