I have no experience with statistics at the college level. The survey results below were from a single school, grades 9 - 12. I'm trying to find out if you can conclude a trend exists in the number of students who prefer Product A versus Product B, even though the number of students surveyed at this one school varied year after year. Can you still safely conclude declines in the number of students who prefer Product A & B? I would like to use this data for a report I'm writing but I don't want to overstep. Thanks in advance for any help you can provide. -- Carol

Years Product A Product B Number of Students Surveyed

1999 15.6% 24.8% (3430)

2000 15.6% 15.7% (3764)

2001 10.1% 12.2% (5240)

2002 11.9% 12.6% (9066)