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Data Generation

Each run of the experiment consisted of one of the group members standing on a chair beneath a string suspended from the ceiling to a point 100 inches above the floor. While holding the helicopter with the bottom of its base at the 100 inch height, that group member (the ``releaser'') released the helicopter. At the release, a second group member (the ``timer'') began timing the fall using a stopwatch. Timing was stopped as soon as any part of the helicopter touched the floor. The third group member recorded the time, which was expressed in hundredths of a second above two seconds (all times were in excess of two seconds). So, for example, a time of 23 means 2.23 seconds.

Each of the three group members took turns releasing and timing. This was done in a random order (we used SAS/INSIGHT to generate the random numbers used to determine the order). Each releaser-timer combination conducted ten drops, resulting in a total of 60 data values.

Figure 1:   Pattern for Making the Helicopter

Table 1:   Plotting Symbols for Groups

Figure 2:   Helicopter Data: Scatterplot of Time versus Order

Figure 3:   Helicopter Data: Scatterplot of Time versus Group

Joseph D Petruccelli
Thu Aug 29 11:44:31 EDT 1996