final conclusion is wrong..

it should be:

more the Time Quantum, lesser number of times the process would be scheduled

and hence completion time will decrease resulting in decrement of TAT.

therefore avg. TAT will decrease on inc of time quantum

it should be:

more the Time Quantum, lesser number of times the process would be scheduled

and hence completion time will decrease resulting in decrement of TAT.

therefore avg. TAT will decrease on inc of time quantum