The table shows data on asthma-related visits. Is there evidence that these visits vary by quarter? Can you detect a trend? A powerful test would be to run a multiple regression in Excel. If the function is already loaded, you will find it in Data> Data Analysis> regression. If not get help in adding the Analysis Tool Pak. To test for quarterly differences, create a variable called Q1 that equals 1 if the data are for the first quarter and 0 otherwise, a variable called Q2 that equals 1 if the date are for the second quarter and 0 otherwise and a variable called Q4 that equals 1 if the date are for the forth quarter and 0 other wise. ( Because you will accept the default, which is to have a constant term in your regression equation, do not include an indicator variable for quarter 3). Also create a variable called Trend that increases by 1 each quarter.

Year	Q1	Q2	Q3	Q4
2001			1,513	1,060
2002	1,431	1,123	994	679
2003	1,485	886	1,256	975
2004	1,256	1,156	1,163	1,062
2005	1,200	1,072	1,563	531
2006	1,022	1,169