9.7 A regression was run using a data set of IJ.S. colleges from years gone by. In-state tuition is in dollars (S). Regression output: Summary .613 a. Predictors: (Constmt). Percentage Of faculty with PhO degrees Of the ss.S49S Sig. (Constant) Coe mcients Unsta ndardized Coeffkients Std. Error 316700 Of PhD a. De*ndent Variable: Average SAT Score .613 a. Interpret the coefficient of "Percentage of faculty with PhD degrees." b. Interpret the statistical significance tests associated with "Percentage of faculty with PhD degrees." State the null and alternative hypotheses, whether the relationship is statistically significant, and the interpretation of the p value. c. Discuss the practical significance of the coefficient of "Percentage of faculty with PhD degrees."