The friendly folks at the Internal Revenue Service (IRS) in the United States and Canada Revenue Agency (CRA) are always looking for ways to improve the wording and format of its tax return forms. Three new forms have been developed recently. To determine which, if any, are superior to the current form, 120 individuals were asked to participate in an experiment. Each of the three new forms and the currently used form were filled out by 30 different people. The amount of time (in minutes) taken by each person to complete the task was recorded. (XR14-10) a. What conclusions can be drawn from these data?
b. What are the required conditions for the test conducted in Part a?
c. Does it appear that the required conditions of the test Part a are satisfied?
Form 1 Form 2 Form 3 Form 4
23 88 116 103
59 114 123 122
68 81 64 105
122 41 136 73
74 108 99 87
90 92 156 81
70 52 175 120
87 54 93 169
155 103 77 130
120 50 88 56
124 135 91 101
103 76 118 143
54 143 86 106
90 124 164 129
124 151 101 104
80 96 74 169
69 76 124 69
123 128 137 76
76 60 69 55
71 127 136 138
94 109 127 122
167 122 135 139
69 88 97 138
105 109 103 132
98 90 86 99
73 56 121 64
79 105 98 89
61 64 59 128
121 127 91 127
56 104 61 161