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The design of controls and instruments affects how easily people can use them. A student project investigated this effect by asking 25 right-handed students to turn a knob (with their Page 2right hands) that moved an indicator by screw action. There were two identical instruments, one with right-hand thread (the knob turns clockwise) and the other with a left-hand thread (the knob turns counterclockwise). The table below gives the times in seconds each subject took to move the indicator a fixed distance.
(a) Each of the 25 students used both instruments. Discuss briefly how you would use randomization in arranging the experiment.
(b) The project hoped to show that right-handed people find right-hand threads easier to use. Do an analysis that leads to a conclusion about this issue.
Performance times (seconds) using right-hand and left-hand threads
Subject
Right-thread
Left-thread
1
113
137
14
107
87
2
105
15
118
166
3
130
133
16
103
146
4
101
108
17
1 1 1
123
5
136
115
18
104
135
6
170
19
112
7
20
89
93
8
116
145
21
78
76
9
75
22
100
10
96
23
11
122
84
24
85
12
148
25
88
13
147
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