Raven's Progressive Matrices Distribution and Frequency Rules Flashcards

Which of the following best explains why RPM norms require periodic restandardization?

Answer: Population score distributions shift upward over generations due to the Flynn Effect

Secular score increases (Flynn Effect) mean older norms underestimate current typical performance, requiring updated standardization samples.

On the Coloured Progressive Matrices (CPM), the distribution of scores among children aged 5–11 tends to exhibit which characteristic?

Answer: Positive skew with many low scores and fewer high scores in younger age bands

For younger children, raw scores cluster at lower values with a long tail toward higher scores, producing positive skew, especially in the youngest age bands.

A researcher finds that the standard deviation of RPM scores in a gifted sample is smaller than in the general population. What does this indicate?

Answer: Scores in the gifted sample are more tightly clustered — less spread — than in the general norm group

A smaller SD in a gifted sample reflects score homogeneity — most high-ability individuals score similarly near the ceiling, reducing variability.

What does 'norm-referenced interpretation' of RPM scores mean?

Answer: An individual's score is compared to the distribution of scores from a representative standardization sample

Norm-referenced interpretation situates an individual's raw score within the frequency distribution of the normative sample to yield relative standing.

In a normal RPM score distribution, approximately what percentage of scores fall within one standard deviation of the mean?

Answer: 68%

By the empirical (68-95-99.7) rule, about 68% of scores in a normal distribution fall within ±1 standard deviation of the mean.

When RPM frequency data show a 'floor effect,' what does this indicate about the test and the sample?

Answer: Many examinees scored near the minimum, limiting downward differentiation

Floor effect occurs when scores cluster at the lowest possible values, indicating the test may be too difficult for that particular sample.

Which calculation converts a raw RPM score into a z-score, enabling comparison across different norm groups?

Answer: z = (raw score − mean) / SD

A z-score is calculated by subtracting the group mean from the raw score and dividing by the standard deviation, placing the score on a universal standard normal scale.