What Is a Confidence Interval Anyway?

Abstract

Forty people are selected at random and given a test to identify their dominant eye. The person holds a piece of paper about 8¹/₂“ by 11” with a 1“ by 1” square cut in the middle at arm’s length with both hands. The person looks through the square at a relatively small object across the room. The person then closes one eye. If he or she can still see the object, the open eye is the dominant eye. If not, the closed eye is the dominant eye.