Using the sample of 63 observations, two variables X1 and X2 are regressed against the dependent variable Y yielding the fitted regression equation Y = 76.40 - 6.388 X1 + 0.870 X2. The standard error of b1 is 2.453. In two - tailed test of the hypothesis that ?1 = 0 at ? = .05, we would conclude that
A. there is a significant positive relationship between X1 and Y.
B. there is a significant negative relationship between X1 and Y.
C. there is insufficient statistical evidence to say that a relationship exists between X1 and Y.
D. there is too much Type II error risk to conclude anything about the relationship.