08/04/23 Thiyagu..........measurement scale

STATISTICS

Meaning

• Statistics appears to have been derived from the Latin ‘status’ meaning a state.

08/04/23 Thiyagu..........measurement scale

08/04/23 Thiyagu..........measurement scale

Statistics

• Statistics techniques used to collect, organize, present, analyse, and interpret data to make better decisions.

08/04/23 Thiyagu..........measurement scale

DESCRIPTIVE STATISTICS

• It is used to describe the data that have collected.• It refers to procedures for organizing, summarizing and

describing quantitative data about the samples .• Ex: measures of central tendency – mean, mode, median• Measure of variability – Std, AD and range

08/04/23 Thiyagu..........measurement scale

INFERENTIAL STATISTICS

• Statistical procedures used for drawing of inferences about the properties of populations from sample data .

08/04/23 Thiyagu..........measurement scale

MEASUREMENT SCALES

• Nominal scale

• Ordinal scale

• Interval scale

• Ratio scale

Stevents (1946) has recognized some types of scales

08/04/23 Thiyagu..........measurement scale

NOMINAL SCALE

• Simple classification of objects or items into discrete groups.

• Eg. Naming of streets, naming of persons and cars

08/04/23 Thiyagu..........measurement scale

ORDINAL SCALE

• Scale involving ranking of objects, persons, traits, or abilities without regard to equality of difference.

• Eg. Line up the students of a class according to height or merits.

08/04/23 Thiyagu..........measurement scale

INTERVAL SCALE

• Interval scales are also called equal unit scales.

• Scale having equal difference between successive categories

• Eg. Intelligence scores, personality scores

08/04/23 Thiyagu..........measurement scale

RATIO SCALE

• Scale having an absolute zero, magnitude and equal intervals

• Eg. Height , weight, number of students in various class

08/04/23 Thiyagu..........measurement scale

Measurement scale

SCALE MAGNITUDE EQUAL INTERVALS

ABSOLUTE ZERO

NOMINAL X X X

ORDINAL X X

INTERVAL X

RATIO