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This is a test hypothesis problem Do people avoid driving on Friday the 13th ? Here are data on 20 Fridays: 10 on the 13th

This is a test hypothesis problem
Do people avoid driving on Friday the 13th ? Here are data on 20 Fridays: 10 on the 13th and the other 10 on the Friday before. Calculate the MEAN difference and SD between traffic on these two Fridays at the 95% level; Traffic Count Dates 6th (x1) 13th (x2) d = (x1 - x2) 1990, July 139246 138548 698 1990, July 138012 132908 5104 1991, September 137055 136018 1037 1991, September 140675 131843 8832 1991, December 123552 121641 1911 1991, December 121139 120723 416 1992, March 128293 125532 2761 1992, March 124631 120249 4382 1992, November 124609 125770 -1161 1992, November 119584 116263 3321

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