Measures of Variably

Evaluating the

Norm Group

Standard Score

t- score

Standard Score

Z-score

Percentile Score or Rank

Types of Scores

Raw Score

Negative Skewed curve

Positively skewed curve

Positively skewed curve

Normal Distribution

Normal Curve

Measure of Variance

Standard deviation

Measure of Variability

Varience

Measure of variability

RANGE

Measurement Scales

Measure of Central Tendency

Histogram

Frequency Polygon

Frequency Distribution

Interpreting Non referenced instruments

Criterion- Referenced Instrument

Norm referenced Instrument

Ratio Score.

Interval Score

Ordinal Scale

Nominal Scale