The British Department of Transportation studied to see if people avoid driving on Friday the 13^th.They did a traffic count on a Friday and then again on a Friday the 13^th at the same two locations ("Friday the 13th," 2013).The data for each location on the two different dates is in table #9.2.6.Estimate the mean difference in traffic count between the 6^th and the 13^th using a 90% level.

Table #9.2.6: Traffic Count Dates 1990, July 99 September 991, September 6th 13th 139246 138548 13/012 132908 137055 136018 133732 991 December 991 December 121139 992. March 128293 123532 1992, March 12/631 120249 1992, November 992, November 124609 122770 11/263