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1.What is least squares regression analysis? What is meant by the total explained, and unexplained variation in the dependent variable. Why is it important to

1.What is least squares regression analysis? What is meant by the total explained, and unexplained variation in the dependent variable. Why is it important to conduct a significance test of the estimated coefficients? Given the attached t-table what are the t-values required for a variable to be significant at the p0.01 and p0.05 and p0.10 levels if the degrees of freedom are 3,5,10,16,23,30,60 and infinity.

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