A linear regression analysis was performed using x1 as a predictor variable. The p-value associated with the regression coefficient for x1 was 0.02, and the sign of the coefficient was negative. Another analysis was performed, this time using both x1 and x2 as predictor variables. In the second analysis, the partial regression coefficient for x1 had a positive sign and the p-value associated with it was 0.39. Given these results, would multicollinearity appear to be present?