Look at the scatter plots that show the relationship between cost and the 75th percentiles of the various test scores at private institutions. Which (if any) of the four exhibit a pattern that rules out analysis using linear regression?

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).