# Question: The paper referenced in the previous exercise also gave the

The paper referenced in the previous exercise also gave the 6-minute walk distances for 248 girls age 3 to 18 years. The median 6-minute walk times for girls for the five age groups were

a. With x = representative age and y = median distance walked in 6 minutes, construct a scatterplot. How does the pattern in the scatterplot for girls differ from the pattern in the scatterplot for boys from Exercise 5.29?

b. Find the equation of the least-squares regression line that describes the relationship between median distance walked in 6 minutes and representative age for girls. y^ = 479.997 + 12.525x

c. Compute the five residuals and construct a residual plot. The authors of the paper decided to use a curve rather than a straight line to describe the relationship between median distance walked in 6 minutes and age for girls. What aspect of the residual plot supports this decision?

a. With x = representative age and y = median distance walked in 6 minutes, construct a scatterplot. How does the pattern in the scatterplot for girls differ from the pattern in the scatterplot for boys from Exercise 5.29?

b. Find the equation of the least-squares regression line that describes the relationship between median distance walked in 6 minutes and representative age for girls. y^ = 479.997 + 12.525x

c. Compute the five residuals and construct a residual plot. The authors of the paper decided to use a curve rather than a straight line to describe the relationship between median distance walked in 6 minutes and age for girls. What aspect of the residual plot supports this decision?

**View Solution:**## Answer to relevant Questions

Data on pollution and cost of medical care for elderly people were given in Exercise 5.14 and are also shown here. The accompanying data are a measure of pollution (micrograms of particulate matter per cubic meter of air) ...Cost-to-charge ratio (the percentage of the amount billed that represents the actual cost) for inpatient and outpatient services at 11 Oregon hospitals is shown in the following table (Oregon Department of Health Services, ...Both r2 and se are used to assess the fit of a line. a. Is it possible that both r2 and se could be large for a bivariate data set? Explain. (A picture might be helpful.) b. Is it possible that a bivariate data set could ...The paper “Developmental and Individual Differences in Pure Numerical Estimation” (Developmental Psychology [2006]: 189–201) describes a study of how young children develop the ability to estimate lengths. Children ...The paper “The Shelf Life of Bird Eggs: Testing Egg Viability Using a Tropical Climate Gradient” (Ecology [2005]: 2164–2175) investigated the effect of altitude and length of exposure on the hatch rate of thrasher ...Post your question