Margin of error  Confidence Intervals
Margin of error
Basic concepts:
 Measures of relative standing  zscore, quartiles, percentiles
Lessons

3.
A survey is done linking the number of concussions a season to hockey players. The NHL consists of $700$ players and we wish to have a confidence level of $0.95$ (corresponding to a critical value of $Z_\frac{\alpha}{2}=1.96$). Let us assume that the point estimate will be $\hat{p}=0.0125$ for every sample taken.

c)
What is the margin of error, if 350 players are sampled?