THIS SLIDE DESCRIBES ABOUT THE STATISTICAL MEASUREMENT SCALE WITH THE EXAMPLES.

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STATISTICS

2. Meaning
• Statistics appears to have been
derived from the Latin ‘status’
meaning a state.
23/07/14 Thiyagu..........measurement scale

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

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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

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

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MEASUREMENT SCALES
• Nominal scale
• Ordinal scale
• Interval scale
• Ratio scale
Stevents (1946) has recognized some types of scales

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NOMINAL SCALE
• Simple classification of objects or
items into discrete groups.
• Eg. Naming of streets, naming of
persons and cars

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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.

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INTERVAL SCALE
• Interval scales are also called equal
unit scales.
• Scale having equal difference
between successive categories
• Eg. Intelligence scores, personality scores

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RATIO SCALE
• Scale having an absolute zero, magnitude
and equal intervals
• Eg. Height , weight, number of students in
various class

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Measurement scale
SCALE MAGNITUDE EQUAL
INTERVALS
ABSOLUTE
ZERO
NOMINAL
X X X
ORDINAL
√ X X
INTERVAL
√ √ X
RATIO
√ √ √