2. Accu-Copiers Inc, sells and services copying machines. As part of its standard service contract, the company agrees to perform routine service on the machines it sells. To obtain information about the time it takes to perform routine service, Accu-Copiers has collected data for 11 service calls. For each service call, y is the number of minutes required and x is the number of copiers services. The estimation of a simple linear model by OLS produces the following table: Regression Statistics Multiple 0.9952 R Square 0.9905 Adjusted R Square 0.9894 Standard Error 4.6152 Observations 11 df MS F ANOVA Regression Residual Total Significance F 2.094E-10 19918.844 21.300184 935.149 9 10 Coefficients 11.4641 24.6022 SS 19918,8438 191.7017 20110.5455 Standard Error 3.4390 0.8045 Intercept Copiers t Stat 3.3335 30.5802 P-value 0.0087 2.09E-10 Lower 95% 3.6845 22.7823 Upper 95% 19.2437 26.4221 1. What are the least square estimates of b, and b-? 2. Interpret the values of b, and b. 3. What is the predicted mean number of minutes required for a service call for three copiers? 4. Can you reject the null hypothesis that the number of copiers has a zero effect on the duration of a service call?