
Concept explainers
a.
Find the regression lines for the men’s and women’s data.
a.

Answer to Problem 11P
Explanation of Solution
Calculation:
Select the men’s data and put it as input in calculator then press STAT button then select EDITING.
Now input year data in L1 column and men’s 100m time in L2 column.
For regression line press STAT go to CALC menu, and select
The display shows slope intecept form of line,
Apply similar method for women’s data and get regerssion line as,
Hence, the regression line are,
b.
Sketch both regression lines on the same graph.
b.

Answer to Problem 11P
Explanation of Solution
Calculation:
Let graph the lines in viewing rectangle [1900,2012]by[340,400] with the help of graphing calculator, then set the viewing window to 1980≤x≤2012,340≤y≤400 then we set Xsc1=2,Ysc1=10 .
Now evaluate intercepts with CALC “intercept”
Now graph of lines will be,
Hence, both regression lines on the same graph is plotted.
Chapter 1 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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