Use the following for questions 7 – 9:A least squares regression analysis of the cost of tuition at a typical four-year private collegeversusyear(from 1976 through 2008) produced the following residual plot.7.Based on this residual plot, which of the following statements must be true?I.Tuition cost decreased from 1976 through 1982.II. This regression equation would underestimate tuition cost in 1992.III The relationship between tuition cost and year is non-linear.
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8.The scatterplot of Log (Tuition cost)versusYear shows a strong, positive, linear pattern.Which oneof the following conclusions can be drawn from this information?
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