In tests designed to measure the effect of the concentration in percent of a certain additive on the drying time in hours of paint, the following data were obtained.

a. Compute the least-squares regression line for predicting drying time (y) from concentration (.r).
b. Construct a 95% confidence interval for the slope.
c. Test Ho: β1 = 0 versus H1: β1

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Concentration of Additive Drying Time 8.7 8.8 8.3 8.7 8.1 8.0 8.1 7.7 7.5 7.2 4.0 4.2 4.6 4.8 5.0 5.2 5.4 5.6 5.8