Compute the difference in traffic counts on the 6th and the, Ask an Expert

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Explain whether to use paired T-test or independent?

In 1993 the British Medical Journal published an article titled, "Is 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. The data below are the number of cars passing Junctions 9 and 10 on the M25 motorway for consecutive Fridays (the 6th and the 13th) for five different months in which the 13th occurred on a Friday. Compute the difference in traffic counts on the 6th and the 13th. Can you conclude that people tend to stay home more on Friday the 13th?

Year Month 6th 13th
1990 July 134,012 132,908
1991 September 133,732 131,843
1991 December 121,139 118,723
1992 March 124,631 120,249
1992 November 117,584 117,263

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