Download Before plunging into videoconferencing, a company tested the speed of its internal computer network. The tests were designed to measure how rapidly data moved through the network under a...

Download Before plunging into videoconferencing, a company tested the speed of its internal computer network. The tests were designed to measure how rapidly data moved through the network under a typical load. Eighty files ranging in size from 20 to 100 megabytes (MB) were transmitted over the network at various times of day, and the time to send the files (in seconds) recorded. Formulate the SRM with
 given by Transfer Time and
 given by File Size.

(a) Plot the residuals versus the
-variable and in time order, as indicated by the column labeled Hours past 8. Does either plot suggest a problem with the SRM?

(b) Compute the Durbin-Watson
 statistic. Does it indicate a problem? For a series of this length, any value of
 that is more than
 away from 2 is statistically significant with
-value smaller than 0.01.

(c) Explain or interpret the result of the Durbin Watson test.