First and foremost, I would like to declare that I have pretty basic knowledge in Statistics.
I have been googling etc which wasn't of much help.
Problem: I have data from 3 years - 2013, 2014, and 2015. Let's say the number of people who encountered an injury each year was:
- 2013: 500 out of 50k (sample size survey in that year)
- 2014: 600 out of 30k
- 2015: 450 out of 39k
What test should I use to see if the increase/decrease is statistically significant?