In Problems 5–12, find the indicated areas. For each problem, be sure to draw a standard normal curve and shade the area that is to be found.
Determine the area under the standard normal curve that lies to the left of
(a) z = -3.49
(b) z = -1.99
(c) z = 0.92
(d) z = 2.90
Step 1 of 5) For each problem, be sure to draw a standard normal curve and shade the area that is to be found. Determine the area under the standard normal curve that lies to the left of (a) z = -3.49 (b) z = -1.99 (c) z = 0.92 (d) z = 2.90 Coefficient of Determination Problem For the model obtained in Example 2, determine the coefficient of determination and the adjusted R2 . Compare the R2 with the two explanatory variables age and daily saturated fat to the R2 with the single explanatory variable age. Comment on the effect the additional explanatory variable has on the value of the model. Approach Use Minitab to determine the values of the coefficient of determination and the adjusted coefficient of determination. Solution Looking back to the output in Figure 15, we see that R2 = 0.847 = 84.7%. This means that 84.7% of the variation in the response variable is explained by the least-squares regression model. In addition, we find that Radj 2 = 0.820 = 82.0%.
