You are here (click or tap to change)    Back to Chapter 11 Main Page

Problem 2


The following set of data is randomly selected from a STA 2122 class of mine from spring 2010. The list includes clicker points earned in class (clickers allow students to answer questions in class and to have their answers scored) and their final averages. Use the data to find the least squares prediction line:
Clicker points    32 11 34  41  16 15  7  15
Class Average  99 70 91 101 79 72 68 68

I plugged an entire class of 200 into SPSS in order to calculate the least squares line for the entire data set.  The results were as follows: y = 0.512X + 70.196 

What does x = 0 represent here?

What is the expected grade for students who do not earn any clicker points?

What is the average grade for a student who has 20 clicker points?


  Back to Chapter 11