13.46 The following model was fitted to a call center’s operation efficiency (rating 1 to 10) on the advertising wait times of callers (in minutes), number of complaints, number of operators, and the previous operation efficiency (rating 1 to 10) for the 25 observations:
yn = 3 + 2x1t + 5.4603x2t + 3.7958x3t + 0.0122yt-1 where yn = operation efficiency x1 = wait times of callers x2 = number of complaints x3 = number of operators The p-values for each independent variable and the lagged variable determined from the model are 0.0031, 0.0573, 0.0175, and 0.0284. Whereas the R-square and the F-test value for the model is 0.7491 and 139.854, respectively.
Based on the results, write a brief report for the company.