   Chapter 4.1, Problem 9P Understanding Basic Statistics

8th Edition
Charles Henry Brase + 1 other
ISBN: 9781337558075

Solutions

Chapter
Section Understanding Basic Statistics

8th Edition
Charles Henry Brase + 1 other
ISBN: 9781337558075
Textbook Problem

Critical Thinking: Lurking Variables Over the past 50 years, there has been a strong negative correlation between average annual income and the record time to run 1 mile. In other words, average annual incomes have been rising while the record time to run 1 mile has been decreasing.(a) Do you think increasing income cause decreasing times to run the mile? Explain.(b) What lurking variables might be causing the change in one or both of the variables? Explain.

(a)

To determine

Whether the increase in annual income causes the low record time to run 1 mile or not.

Explanation

The correlation coefficient makes no implication about the cause or effect relationship between the two variables. Increase in both the variables at same time will not depict ...

(b)

To determine

The lurking variable that causes the change in one or both of the variables.

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