Direct cost Number of months 11 20 25 24 11 10 Preliminary calculations are: = 198; y = 465; xy = 4490 2 = 1920; y2 = 10661 Here is a linear regression report:

DETAILED REPORT Regression Statistics Multiple Coefficient of Determination R^2 Coefficient of Determination

R^2 Standard Error Observations 0.8998 0.8096 0.8001 22 VARIANCE ANALYSIS Degree of Freedom Sum of Mean of Squares Critical Value of F 0.000000 85.0610 Regression Residuals Total for threshold of

Lower limitUpper limit Coefficients Standard error Statistical probability for confidence threshold = 95% confidence = 95% 1.2451 0.5843 2.2101 0.0000 Constant Number of months