Statisticians have been able to show that the normal bell curve property also occurs when the sample size is 30 observations or fewer.

Question

Quizplus · Accepted Answer

The normal bell curve, or the central limit theorem, typically applies when sample sizes are large (usually n > 30). For smaller sample sizes, the distribution of the sample mean may not approximate a normal distribution unless the population distribution is normal.

Statisticians Have Been Able to Show That the Normal Bell