# Shapiro-Wilk Test

**Use:** The Shapiro-Wilk test is a statistical test used to assess whether a given sample of data follows a **normal distribution.** It is particularly effective for relatively small sample sizes.

**Example:** Checking if the scores of a standardized test in a population follow a normal distribution.

<figure><img src="/files/KsLeieeJIdKo9jyIKqSx" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
**Column Requirement:** Continuous data.
{% endhint %}

**Steps:**

1. Select a column with continuous data.
2. Perform the Shapiro-Wilk test to check for normality.
3. Evaluate the test statistic and associated p-value.
4. A low p-value (<0.05) indicates deviation from normality.
5. Normality assumption is violated if the p-value is less than the chosen significance level.


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