Would you guess that people tend to buy more jeans when the weather is warm or when it is cold? The following table shows the number of jeans (in thousands of pairs) sold in the United Kingdom in January and June for the years 1980-1985. Construct a 90% confidence interval for the difference, on average, of the number of jeans that are sold in different seasons each year.   Year             1980.     1981.      1982.    1983.    1984.    1985 Jan.                1998.     1924.     1969.     2149.    2319.    2137 June               2286      1979      2375      2369     3126     2117

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