A control systems engineer is trying to decide the arrangement of instruments on a control panel that results in the fastest response of an operator to an emergency situation. She builds panels with four arrangements and tries each on three operators in a simulated emergency. The times to respond to the emergency are given:
Layout 1 2 3 4
Response Times (tenths of seconds)
Operator A 8 11 5 12
Operator B 14 15 11 18
Operator C 10 11 6 15
Is there a difference in response times based on the design?