Concept explainers
The data in the accompanying table is from the paper “Six-Minute Walk Test in Children and Adolescents” (The Journal of Pediatrics [2007]: 395–399). Two hundred and eighty boys completed a test that measures the distance that the subject can walk on a flat, hard surface in 6 minutes. For each age group shown in the table, the
- a. With x = Representative age and y = Median distance walked in 6 minutes, construct a
scatterplot . Does the pattern in the scatterplot look linear? - b. Find the equation of the least-squares line that describes the relationship between median distance walked in 6 minutes and representative age.
- c. Calculate the five residuals and construct a residual plot. (Hint: See Examples 5.7 and 5.8.)
- d. Are there any unusual features in the residual plot?
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Chapter 5 Solutions
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