The following data show the retail price for 12 randomly selected laptop computers along with their corresponding processor speeds in gigahertz.

a. Develop a linear equation that can be used to describe how the price depends on the processor speed.

b. Based on your regression equation, is there one machine that seems particularly over- or underpriced?

c. Compute the correlation coefficient between the two variables. At the .05 significance level conduct a test of hypothesis to determine if the population correlation could be greater than zero.

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Computer Speed Price Computer Speed Price 1 2.0 $2,689 7 2.0 $2,929 2 1.6 1,229 8 1.6 1,849 3 1.6 1,419 9 2.0 2,819 4 1.8 2,589 10 1.6 2,669 5 2.0 2,849 11 1.0 1,249 6 1.2 1,349 12 1.4 1,159