A chemist is interested in determining the weight loss y of a particular compound as a function of the amount of time the compound is exposed to the air. The data in the following table give the weight losses associated with n = 12 settings of the independent variable, exposure time.

a. Determine the least- squares prediction equation for the model
y = β0 + β1x + e.
b. Test H0: β1 ‰¤ 0; give the p-value for Ha: β1 > 0, and draw conclusions.

Weight Loss and Exposure Time Data Weight Loss,y (in pounds) Exposure Time (in hours) Exposure Time Weight Loss, y in pounds) 4.3 5.5 6.8 8.0 4.0 5.2 (in hours) 6.6 7.5 2.0 4.0 5.7 6.5