# Question: In tests designed to measure the effect of the concentration

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 < 0. Can you conclude that concentration is useful in predicting drying time? Use the a = 0.05 level of significance.

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 < 0. Can you conclude that concentration is useful in predicting drying time? Use the a = 0.05 level of significance.

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