chapter  5
46 Pages

Statistics and the Normal Distribution

The normal distribution arises whenever we make a succession of imperfect measurements of a quantity that is supposed to have a definite value. If all the students in a class take the same test, we may think of their grades as being imperfect measurements of the average capability of the class. In general, when we make a number of independent measurements, the average is intuitively going to be an approximation of the quantity we are trying to find.