Answer to Question #46755 in Statistics and Probability for Rajashri

Question

Associated with a job are two random variables: CPU time required (Y) and number of disk I/O
Operations (X).
i Time
(sec)
yi Number
xi
1 40 398
2 38 390
3 42 410
4 50 502
5 60 590
6 30 305
7 20 210
8 25 252
9 40 398
10 39 392

(i) Find the regression equation.
(ii) What is the estimate increase in CPU time for one additional disk operation.
(iii) Comment on the goodness of the model.