The shape of the normal probability distribution is determined by the population standard deviation $\sigma$. Small values of $\sigma$ reduce the height of the curve and increase the spread; large values of $\sigma$ increase the height of the curve and reduce the spread.

Question

Quizplus · Accepted Answer

The standard deviation affects the spread of the normal distribution: small values make the curve taller and narrower, while large values make it shorter and wider.

The Shape of the Normal Probability Distribution Is Determined by the Population