School administrators wondered whether class size and grade achievement (in percent) were related. A random sample of classes revealed the following data.

Find yʹ when x = 12.

For each exercise, find the equation of the regression line and find the yʹ value for the specified x value. Remember that no regression should be done when r is not significant.

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No. of students 18 6 84 92 15 10 10 8 20 Avg. grade (%) 85 90 82 80 90