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Chapter Summary
Chapter Five – Reliability and Validity of Measurements
1.
A variable is some property of an event in the world that has been measured.
2.
A DV is a measure of the behaviour of the subject on one of several different
dimensions.
3.
An IV is one that is believed to cause some change in the value of the dependent
variable.
4.
The different values of an IV are called the
levels
of the variable.
5.
A subject variable is an IV that the researcher does not manipulate, but measures
instead.
6.
A confounded variable is one that varies with the IV.
7.
Quantitative variables vary in amount, whereas categorical variables differ in
kind.
8.
A continuous variable is one that is not limited to a certain number f values.
9.
A discrete variable is one that falls into a certain number of distinct bins.
10. The apparent limits of a number are the point indicated by the number itself; the
real limits are the interval defined by the number plus or minus half the difference
to the next numbers.
11. Measurement is the assignment of numbers to objects or events according to rules
that permit important properties of the objects or events to be represented by
properties of the number system.
12. Four scales of measurement are distinguished according to the rules by which
numbers are assigned to objected or events; nominal, ordinal, interval, and ratio.
13. A nominal. Scale is one that classifies objects or events into categories. Objects or
events of the same kind get the same number and different objects/events get
different numbers.
14. An ordinal scale is one that ranks objects or events in order of their magnitude. An
ordinal position of the numbers on the scale must represent the rank order of the
psychological attributes of the objects/events.
15. An interval scale is one in which the differences between the numbers on the scale
are meaningful. Equal differences between the numbers on the scale must
represent equal differences between the event/objects.
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 Fall '01
 staff
 Psychology

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