The following table gives data for the number of students (in millions)
attending public college per year, between 2015 and 2020.
2015 2016 2017 2018 2019 2020
14.57 14.59 14.57 14.54 14.5 13.87
(a) Let x = 15 correspond to the year 2015. Create a linear model (a
line) using the data from 2015 and 2016.
(b) Create a linear model (a line) using the data from 2017 and 2020.
(c) Using residuals, find which line better approximates the data given.