Answer:
Descriptive Statistics
Explanation:
The restriction to expressing relationships with descriptive statistics is a limitation of descriptive statistics themselves. Descriptive statistics are primarily used to summarize and describe data, providing information about central tendencies, variability, and the distribution of a dataset. However, they have limitations when it comes to expressing complex relationships or causality between variables, which can often be better addressed with inferential statistics or other analytical methods. Descriptive statistics are valuable for providing a basic overview of data but may not capture the full complexity of relationships in more advanced analyses.