People swam across Lake Ontario 52 times between 1974 and 2013 (www.soloswims.com). We might be interested in
Question:
Dependent variable is Time
R-squared = 1.2% s = 439.1
Variable Coefficient
Intercept ¦¦¦¦¦¦¦ 1213.423
Year since 1974 ¦¦¦¦. 3.986
a) What does the R2 mean for this regression?
b) Are the swimmers getting faster or slower? Explain.
c) The outlier seen in the residuals plot is a crossing by Vicki Keith in 1987 in which she swam a round trip, north to south, and then back again. Clearly, this swim doesn't belong with the others. Would removing it change the model a lot? Explain.
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Related Book For
Stats Data and Models
ISBN: 978-0321986498
4th edition
Authors: Richard D. De Veaux, Paul D. Velleman, David E. Bock
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