Find the slope of the regression line we would use to estimate cost from the 75th percentile SAT math scores at private institutions. Write a sentence to interpret that slope.

Use the datasets "Public" (https://openstax.org/r/Chapter8 Data-Sets) and "Private" (https://openstax.org/r/Chapter8 Data-Sets), which give many institutions of higher learning in the United States (public institutions in "Public" and private, non-profit institutions in "Private"), the schools' 75th percentiles on the math section of the SAT (SATM75), the verbal section of the SAT (SATV75), the math section of the ACT (ACTM75), and the English section of the ACT (ACTE75). It also gives the schools' admission rates (AdmRate) and total annual cost of attendance (Cost).