Refer to Exercise 47. Use the equation of the leastsquares regression line and the residual plot to estimate the actual mean weight of the infants when they were 1 month old.

Exercise 47.

A study of nutrition in developing countries collected data from the Egyptian village of Nahya. Researchers recorded the mean weight (in kilograms) for 170 infants in Nahya each month during their first year of life. A hasty user of statistics enters the data into software and computes the least-squares line without looking at the scatterplot first. The result is weight^ = 4.88 + 0.267 (age). Use the residual plot to determine if this linear model is appropriate.

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0.50 0.25 0.25 -0.50 -0.75 -1.00 2 4 6 8. 10 12 Age (months) Residual