A person’s muscle mass is expected to decrease with age. To explore this relationship

in women, a nutritionist randomly selected 15 women from each l0-year age group,

beginning with age 40 and ending with age 79. Each woman’s muscle mass was then measured using a standard technique. The goal of this analysis was to determine if a polynomial regression model would do an adequate job of describing the relationship between Y (muscle mass) and X (age). The variables in the data set are as follows:

AGE:                         age in years

MUSC_MASS:         muscle mass

Based on the following scatterplot, which would you say that the quadratic model (solid line) fits the data well? Give a reason for your answer.

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