## What do they call mental retardation now?

In the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), the APA replaced “mental retardation” with “intellectual disability (intellectual developmental disorder).” The APA included the parenthetical name “(intellectual developmental disorder)” to indicate that the diagnosed deficits …

## How do you convert to scaled score?

You need to follow the chart. Apply the formula to every raw score to get your scaled score. i.e., we know that the transformation formula is scaled score = (raw score + 15)/2. If we apply the formula, we get that for a raw score of 10; it corresponds to a scaled score of 12.5.

## What percentage of the population has an IQ between 130 or 140?

IQ score ranges

IQ scale Interpretation of IQ score % of population
111-120 Above average intelligence 15.7%
90-110 Average intelligence 51.6%

## What is a grade Stanine?

Stanine is short for standard nine. A stanine score ranges from a low of 1 to a high of 9; therefore, the name “stanine.” For instance, a stanine score of 1, 2, or 3 is below average; 4, 5, or 6 is average; and 7, 8, or 9 is above average.

## What does a Stanine score of 6 indicate?

Stanine Scores A stanine score ranges from a low of 1 to a high of 9; therefore, the name “stanine.” For instance, a stanine score of 1, 2, or 3 is below average; 4, 5, or 6 is average; and 7, 8, or 9 is above average.

8-10

60

## What percent of scores fall between and +1sd on a normal curve?

Regardless of what a normal distribution looks like or how big or small the standard deviation is, approximately 68 percent of the observations (or 68 percent of the area under the curve) will always fall within two standard deviations (one above and one below) of the mean.

## How are Stanine scores calculated?

Finally, calculate the z-score using the formula: (student result – Mean) / Standard Deviation. Stanine scores are used in education to compare student performance over a normal distribution. Stanine scores convert raw test scores to a one-digit whole number to simplify test interpretation.

## What is the average level of intelligence in a normal distribution?

Based on the 7 Rule, approximately 68% of the individuals in the population have an IQ between 85 and 115.