A scientist investigating a particular celestial phenomenon formulates a least-squares regression line to examine the relationship between the luminosity and the diameter, both measured in astronomical units, of celestial bodies. The findings are illustrated in the following computer-generated output. Variable Estimate T Intercept 1 5 4.00 2.50 Diameter 1 30 2.50 13.20 Which of the following values represents the predicted change in the luminosity of a celestial body for a seven- astronomical unit increase in the diameter? (A) 210 (B) 35 (C) 28 (D) 17.5 (E) 7/30
