PC Data Analysis and Interpretation Flashcards

The standard error of measurement (SEM) is used by psychometricians to:

Answer: Estimate the range of error around an observed score

The SEM estimates the amount of error in an individual's observed score, helping construct confidence intervals around that score.

Which analytical approach compares the performance of test items across different demographic subgroups to detect bias?

Answer: Differential Item Functioning (DIF) analysis

Differential Item Functioning analysis statistically identifies items that perform differently for subgroups of equal ability, indicating potential bias.

In Item Response Theory (IRT), the item discrimination parameter (a) indicates:

Answer: How well an item differentiates between high and low ability examinees

The discrimination parameter (a) reflects the slope of the item characteristic curve, showing how sharply performance differences correspond to ability differences.

A negatively skewed score distribution in psychometric data indicates that:

Answer: Most scores cluster at the high end with a few low outliers

A negatively skewed distribution has most scores concentrated at the higher end, with a tail extending toward lower scores.

When conducting a multiple regression analysis with psychometric data, multicollinearity refers to:

Answer: High correlations among predictor variables

Multicollinearity occurs when predictor variables are highly intercorrelated, making it difficult to isolate each predictor's unique contribution.

A psychometrician reviewing test data notices a bimodal score distribution. This most likely suggests:

Answer: The sample may contain two distinct subpopulations

A bimodal distribution with two distinct peaks often indicates the sample consists of two groups with different ability levels or characteristics.