Stat 1000: Mistake in Practise Solutions

Published: Wed, 04/06/11

A couple of students have pointed out that I made a mistake in my answer for question 2c in the Part B of Sample Exam A.

I correctly point out that n=40, but accidentally used n=30 again when computing the z-score.

It should be z = (3-5)/(4/root40)

That makes z = -3.16, so the correct probability is .0008.