Xavier notices that everyone in his class reads at very different speeds. He wonders if a person's reading speed is related to the number of books he or she reads.
Xavier asks a few students in his class how many books they read last month, x, and times how long it takes them to read the same paragraph (in seconds), y.
The least squares regression line of this data set is:
y= –16.739x+163.873
For each additional book read last month, the least squares regression line predicts a student would take ___
fewer seconds to read the paragraph.