# Can I use Paired Proportions Test

If I wish to see if a crime rate during period x is the same (statistically) as period y, could I use a paired proportions test?

• A percentage is any portion or share in relation to a whole; as such, to calculate a percentage, one needs to know the size of the whole, $n$, often called the "sample size", and one needs to know the number within that whole meeting the desired criteria, $k$. The proportion is calculate by dividing the number meeting that criteria with the size of the entire whole, $p=k/n$. – Gregg H Mar 28 '18 at 14:51