Question 8.15: For the goodput data, find the residual for the point Speed ......

ISE Principles of Statistics for Engineers and Scientists [987713]

For the goodput data, find the residual for the point Speed = 20, Pause = 30.

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The observed value of goodput (Table 8.2) is y = 84.937. The predicted value ŷ is found by substituting Speed = 20 and Pause = 30 into the fitted model presented in the solution to Example 8.14. This yields a predicted value for goodput of ŷ = 86.350. The residual is given by y − ŷ = 84.937 − 86.350 = −1.413.

TABLE 8.2 Average node speed, pause time, and goodput for computer networks
Speed (m/s)	Pause Time (s)	Goodput (%)	Speed (m/s)	Pause Time (s)	Goodput (%)
5	10	95.111	20	40	87.800
5	20	94.577	20	50	89.941
5	30	94.734	30	10	62.963
5	40	94.317	30	20	76.126
5	50	94.644	30	30	84.855
10	10	90.800	30	40	87.694
10	20	90.183	30	50	90.556
10	30	91.341	40	10	55.298
10	40	91.321	40	20	78.262
10	50	92.104	40	30	84.624
20	10	72.422	40	40	87.078
20	20	82.089	40	50	90.101
20	30	84.937

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