# Question: The residuals given by the service time prediction equation y bar

The residuals given by the service time prediction equation y-bar = 11.4641 + 24.6022x are listed in Table 13.7(a).

a. In this exercise we construct a normal plot of these residuals. To construct this plot, we must first arrange the residuals in order from smallest to largest. These ordered residuals are given in Table 13.7(b). Denoting the ith ordered residual as e(i) (i = 1, 2, . . . , 11), we next compute for each value of i the point z(i). These computations are summarized in Table 13.7(b). Show how z(4) = – .46 and z(10) = 1.05 have been obtained.

b. The ordered residuals (the e(i)’ s) are plotted against the z(i)’s in Figure 13.28(c). Does this figure indicate a violation of the normality assumption? Explain.

a. In this exercise we construct a normal plot of these residuals. To construct this plot, we must first arrange the residuals in order from smallest to largest. These ordered residuals are given in Table 13.7(b). Denoting the ith ordered residual as e(i) (i = 1, 2, . . . , 11), we next compute for each value of i the point z(i). These computations are summarized in Table 13.7(b). Show how z(4) = – .46 and z(10) = 1.05 have been obtained.

b. The ordered residuals (the e(i)’ s) are plotted against the z(i)’s in Figure 13.28(c). Does this figure indicate a violation of the normality assumption? Explain.

**View Solution:**## Answer to relevant Questions

Accu-Copiers, Inc., sells and services the Accu-500 copying machine. As part of its standard service contract, the company agrees to perform routine service on this copier. To obtain information about the time it takes to ...An accountant wishes to predict direct labor cost (y) on the basis of the batch size (x) of a product produced in a job shop. Data for 12 production runs are given in Table 13.5, along with the Excel output from fitting a ...Model: y = β0 + β1x1 + β2x2 + β3x3 + ε Sample size: n = 30 What does the distance value measure? How does the distance value affect a confidence or prediction interval? Recall from Exercise 14.5 that Enterprise Industries has observed the historical data in Table 14.5 concerning y (demand for Fresh liquid laundry detergent), x1 (the price of Fresh), x2 (the average industry price of ...Post your question