In Exercise 40, we saw that Vicki Keith's round-trip swim of Lake Ontario was an obvious outlier among the one-way times. Here is the new regression after this unusual point is removed:
Dependent variable is Time
R-Squared = 4.5% s = 322.7
Variable Coefficient
Intercept ……………….. 1139.794
Year since 1974 ……….. 5.691
a) In this new model, the value of se is smaller. Explain what that means in this context.
b) Now would you be willing to say that the Lake Ontario swimmers are getting faster (or slower)?