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 median distance walked by the boys in that age group is also given.
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 regression line that describes the relationship between median distance walked in 6 minutes and representative age.
c. Compute the five residuals and construct a residual plot. Are there any unusual features in the plot?

  • CreatedSeptember 19, 2015
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