In 1993 the British Medical Journal published an article titled, Is Friday the 13th Bad for Your

In 1993 the British Medical Journal published an article titled, €œIs Friday the 13th Bad for Your Health?€ Researchers in Britain examined how Friday the 13th affects human behavior. One question was whether people tend to stay at home more on Friday the 13th€”an issue of great concern, for example, to restaurants and theaters. The data in the table are the number of cars passing Junctions 9 and 10 on the M25 motorway for consecutive Fridays (the 6th and 13th) for five different periods.

Identify and use an appropriate nonparametric test to judge whether there is a difference in traffic between consecutive Fridays when one is the 13th.

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YearMonth 6th 13th 1990 Julby 1991 September 133,732 131843 1991 December 21,1318,723 1992 March 1992 Nmber 117,584117,263 134,012 132,908 124,631 120,249