Wilk-Shapiro Test

The Shapiro-Wilk test is a statistical method used to determine whether a set of data is approximately normally distributed—that is, whether it follows the bell-shaped curve common in many natural phenomena. It compares the data's patterns to a perfect normal distribution, giving a score and a probability. If the probability is low, it suggests the data likely do not follow a normal distribution. This test helps researchers decide which statistical methods are appropriate for analyzing their data, ensuring valid conclusions.