PROBLEM 3 Fitts's law is a model of human movement (useful in human-computer interaction and ergonomics) which described the relation between the target distance, width and time needed for a target acquisition task: ID = 1092(W/ + 1) Target Width Target where D is the task amplitude (distance to target), 6 Inches Amplitude W is the target's width, and the resulting ID is the aforementioned Index of Difficulty In the class experiment we will keep the movement time and target size (W) fixed and vary only the distance. The tasks will be run for 30s each at fixed tempo provided by the metronome. Mark your responses on the provided data collection sheet. Afterwards, you will be collecting information on how many times the target was "missed" compared to the task difficulty index (ID). That data will then be plotted as a function of ID; regression will be used determine the best fitting function (with Excel help). If you would want to explore the Fitt's Law further, many good online tests can be found on the web, including this one . Setup # of Errors Amplitude Width ID A 3 2.0 0.5 B 16 6.0 0.5 C 25 10.0 0.5 D 35 15.0 0.5 40 35 30 25 # of Errors 20 15 10 UT 0 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 ID