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2. Use the data in Canvas under Module 2 Practice Set 2 for the following question.
a) Use the applet to find the least-square regression line. Write the equation below.
Y=22.0881 +0.4685x
b) Mr. Edwards is 6 feet tall. Use your model to predict his shoe size.
9-220881+0.4685 (66)
248991
c) Mr. Edwards' actual shoe size is 10%. Calculate and interpret the residual for this point.
d) Interpret the slope of the regression line.
e) Interpret the y-intercept of the regression line.
3. This question will continue using the same data set as the previous problem.
a) Determine the correlation coefficient for the data set.
b) Unfortunately, all of the heights were measured in inches, but we actually need them in centimeters.
How will the correlation coefficient change if we change the units? Explain.
c) One student with a shoe size of 12 accidentally put their height down as 60 inches (5 feet) instead of 72
inches (6 feet). What will happen to your correlation coefficient when we add the point (60, 12) to the
data? Explain.
Sagot :
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