(c) For each of your regressions, Interpret the adjusted coefficient of determination. Is the model likely to be useful in predicting the percentage of chlorine depletion over 8 hours? Explain your answer. ii. Test the overall significance of the model at the 5% significance level. What are the hypotheses, the statistical decision, and the conclusion? Be precise. Ill. Based on your expectations in part (b) of Exercise 2, test appropriate hypotheses concerning the slope coefficients using t-tests at the 5% significance level. What are your decisions and conclusions? iv . Interpret the slope coefficients that you deemed significant in the expected direction