For Exercises use the same data as for the corresponding exercises in Section 10–1. For each exercise, find the equation of the regression line and find the y  value for the specified x value. Remember that no regression should be done when r is not significant.

The average gasoline price per gallon (in cities) and the cost of a barrel of oil are shown below for a random selection of weeks from 2009–2010.

Find the cost of gasoline when oil is $60 a barrel.

The average gasoline price per gallon (in cities) and the cost of a barrel of oil are shown for a random selection of weeks from 2009–2010. Is there a linear relationship between the variables?

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Oil ($) Gasoline ($) 46.25 37.51 78.00 75.39 84.88 73.78 2.197 2.182 2.987 3.015 3.109 3.000