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(02.04 MC)
The mean unemployment rate in February of each year from 1990 to 2000 is x =
5.65, with a standard deviation of sx = 0.92. The mean unemployment rate in July of
each year for the same time frame is y = 5.62, with a standard deviation of sy = 1.3.
The correlation coefficient is r = 0.91.
Part A: Find the equation of the least-squares regression line for predicting July
unemployment rate from February's unemployment rate. Show your work. (3 points)
Part B: Use the regression line to predict the unemployment rate if February's rate is
3.8. Show your work. (3 points)
Part C: Find and interpret r-squared. (4 points)
Sagot :
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