Norm referenced Instrument

Normal Distribution

Normal Curve

Positively skewed curve

Positively skewed curve

Criterion- Referenced Instrument

Negative Skewed curve

Interpreting Non referenced instruments

Types of Scores

Raw Score

Frequency Distribution

Frequency Polygon

Histogram

Measure of Central Tendency

Measures of Variably

Percentile Score or Rank

Measure of variability

RANGE

Measurement Scales

Standard Score

Z-score

Nominal Scale

Standard Score

t- score

Evaluating the

Norm Group

Ordinal Scale

Interval Score

Measure of Variability

Varience

Ratio Score.

Measure of Variance

Standard deviation