Question

Are good grades in high school associated with family togetherness? A simple random sample of 142 high-school students was asked how many meals per week (x) their families ate together. Their responses produced a mean of ¯x = 3.78 meals per week, with a standard deviation of2 sx = 2.2. Researcherss then matched these responses against the students' grade point averages (GPAs). The scatterplot appeared to be reasonably linear, so they created a regression line. No apparent pattern emerged in the residuals plot. The equation of the line was GPA=2.73+.11(Meals).