6 138,548 134,012 132,908 137,055 136,018 133,732 131,843 123,552 121,641 121,139 118,723 128,293 125,532 124,631 120,249 124,609 122,77
how can a two sample t-test help determine whether this data is attributable to chance factors?
The question of whether Friday the 13th is an unusually unlucky day or whether this idea is just superstition was evaluated. Researchers in the United Kingdom examined the relation between (a)numbers of traffic accidents on past Friday the 13ths versus (b) numbers of accidents occurring on Friday the 6ths (all between July 1990 and November 1992)
Friday the 6th Friday the 13th
139,246 138,548
134,012 132,908
137,055 136,018
133,732 131,843
123,552 121,641
121,139 118,723
128,293 125,532
124,631 120,249
124,609 122,770
117,584 117,263
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