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What Is the Importance of Item Difficulty and How Is

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What is the importance of item difficulty and how is it calculated?


Definitions:

Numerical Index

A quantitative measure or indicator that represents statistical data points or trends.

Curvilinear Relationship

A type of relationship between two variables where the change in one variable has a non-linear effect on the other variable, often visualized as a curved graph.

Correlation Matrix

A table showing correlation coefficients among more than two variables.

Scatterplot

A type of graph used to display values for two variables for a set of data, showing the relationship between them.

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