Question 221022
A standard placement test has a mean of 105 and a standard deviation of σ = 13. Determine the minimum sample size if we want to be 99% certain that we are within 3 points of the true mean
--------------------------------------
n = [z*sig/E]^2
--- 
invNorm(0.005) = -2.576
n = [2.576*13/3]^2
---
n = 124.6
---
Round up to n= 125
================================