Answer the following questions regarding the folate data below.

1. What is the slope and y-intercept? 2. Given a plasma folate concentration of 10 ng/mL what is the predicted folate by the new method? 3. What percentage of the data is explained by the regression? 4. How does the bias as estimated by the regression plot compare to the bias determined by the difference between means in the table of B12 and folate below?

Regression Folate Dependent Y New Independent X Current Sample size 20 Coefficient of determination R2 0.8499 Standard Error of Estimate 1.47 Regression Equation y = 0.3766 + 1.0539 x Parameter Coefficient Std. Error 95% CI P Intercept 0.3766 1.4518 2.6734 to 3.4266 0.2594 0.7983 Slope 1.0539 0.1044 0.8346 to 1.2733 10.0952