Question: The following response-time data (in msec) was obtained on Farmer Brown and his son Big John while operating a tractor using the right foot to

The following response-time data (in msec) was obtained on Farmer Brown and his son Big John while operating a tractor using the right foot to control the clutch, brake and accelerator. The foot is normally kept on the rest position. The location and sizes of the pedals are shown below as well as some sample response times for activating a given control from the rest position.

(a) What is the index of difficulty value for each pedal?
(b) Plot the response times. What law can be used to explain the relationship between response times and the difficulty in activating a given control?
(c) What is the simple reaction time for Farmer Brown?
(d) What is the bandwidth for Big John?
(e) Which farmer is the better tractor operator? Why?

Clutch Accelerator Brake 432 428 Famer Brown Big John 300 600 630 270 Accelerator Rest Position Clutch Brake 3" 2"

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a The index of difficulty is defined in bits by ID log 2 2DW b The relationship between Farmer Browns response time and the index of difficulty is known as Fitts Law and is found by leastsquares regression to be FBRT 194 104 ID With an r 2 of 999 p 022 The regression equation for Big Johns response time is BJRT 167 107 ID With an r 2 of 990 p 064 c The simple reaction time is the intercept with ID equal to zero For Farmer Brown ... View full answer

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