
Concept explainers
a.
Find a regression equation for the data.
a.

Answer to Problem 49STP
Explanation of Solution
Given information:
The table shows the relationship between the total number of male students per school and the number of students who tried out for the football team.
Find a regression equation for the data.
Calculation:
Consider the table showing the relationship between the total number of male students per school and the number of students who tried out for the football team
Use the regression capabilities of the graphing utility to find the linear regression line for the data.
The least square regression line is expressed as
Here
Press
Press ENTER until the calculator screen says “Done”.
Press y
Put the values of 1
Press
Select the LnReg
Hence, the required linear regression line is:
b.
Determine the
b.

Answer to Problem 49STP
Explanation of Solution
Given information:
The table shows the relationship between the total number of male students per school and the number of students who tried out for the football team.
Determine the
Calculation:
Hence, the correlation coefficient is
c.
How many students will try out for football at a school with
c.

Answer to Problem 49STP
Explanation of Solution
Given information:
The table shows the relationship between the total number of male students per school and the number of students who tried out for the football team.
Predict how many students will try out for football at a school with
Calculation:
Consider the school with
Substitute
Hence, the number of students tried out for the football team is
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