Question 1
Consider the data set shown below. Find the estimate of the y-intercept of the least squares regression line.
◦ 1.5
◦ 0.9003
◦ 0.94643
◦ 1.49045
Question 2
In a comprehensive road test for new car models, one variable measured is the time it takes the car to accelerate from 0 to 60 miles per hour. To model acceleration time, a regression analysis is conducted on a random sample of 129 new cars.
TIME60:
y = Elapsed time (in seconds) from 0 mph to 60 mph
MAX:
x = Maximum speed attained (miles per hour)
The simple linear model
E(
y) =
β0 +
β1x was fit to the data. Computer printouts for the analysis are given below:
NWEIGHTED LEAST SQUARES LINEAR REGRESSION OF TIME60
CASES INCLUDED 129 MISSING CASES 0
Find and interpret the estimate
1 in the printout above.
Three models of succession.
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