This is the problem 3 that the question in top is talking about

Problem 3 Finding the Line of Best Fit College Tuition Use a graphing calculator to find the equation Average Tuition and Fees of the line of best fit for the data at the right. What is the at Public 4-Year Colleges correlation coefficient to three decimal places? Predict the Academic Cost cost of attending in the 2012-2013 academic year. Year ($) Step 1 Press (stat) . From the EDIT menu, choose Edit. Enter 2000-2001 3508 the years into L. Let x = 2000 represent academic 2001-2002 3766 year 2000-2001, x = 2001 represent 2001-2002, and so on. Enter the costs into 12- 2002-2003 4098 Step 2 Press (stat) . Choose LinReg(ax + b) from the CALC 2003-2004 4645 menu. Press center to find the equation of the line of 2004-2005 5126 best fit and the correlation coefficient. The calculator 2005-2006 5492 uses the form y = ax + b for the equation. 2006-2007 5836 slope SOURCE: The College Board LinReg y = ax + b a - 409.4285714 b = -815446.7143 y-intercept -.9919891076 r = .9959864997 correlation coefficient Round to the nearest hundredth. The equation of the line of best fit is y = 409.43.x - 815,446.71. The correlation coefficient is about 0.996. Step 3 Predict the cost of attending in the 2012-2013 academic year. y = 409.43x - 815,446.71 Use the equation of the line of best fit. y = 409.43(2012) - 815,446.71 Substitute 2012 for x. y = 8326 Simplify. Round to the nearest whole number. The cost of attending a four-year public college in the 2012-2013 academic year is predicted to be about $8326