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Psychology
Research Methods
Distributions
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Created by
Jaskirat Kaur
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Cards (26)
What is an IQ test primarily composed of?
A series of
logic questions
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What does an IQ score measure?
It measures intelligence
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What is the average IQ score?
100
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What does a higher IQ score indicate?
Greater
intelligence
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How do most people's IQ scores relate to the average?
They score close to
100
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What shape does the distribution of IQ scores form on a graph?
A
bell shape
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What is the term for the common distribution of data that forms a bell shape?
Normal distribution
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What are the characteristics of a normal distribution?
Symmetrical curve
Mean
,
median
, and
mode
are equal
Sides do not touch the x-axis
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What does the y-axis represent in a histogram?
Frequency
of scores
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What does the x-axis represent in a histogram?
Value
of the scores
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What does the mode represent in a normal distribution?
The
most
common
score
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How is the median defined in a normal distribution?
It is the
middle score
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What does the mean represent in a normal distribution?
The
average
score
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How does the symmetry of the curve affect the mean, median, and mode?
They are all at the center
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What percentage of scores falls within one standard deviation of the mean?
68%
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What percentage of scores falls within two standard deviations of the mean?
95%
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What percentage of scores falls within three standard deviations of the mean?
99.7%
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If someone scores 130 on an IQ test, what does this indicate about their position in the population?
They are in the top
2.5%
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How is abnormality defined in terms of IQ scores?
As
statistically
infrequent scores
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What are the characteristics of skew distributions?
Scores shifted to one side
Long tail either right (
positive
) or left (
negative
)
Not
symmetrical
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What indicates a positive skew in a distribution?
The tail points to the
right
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What indicates a negative skew in a distribution?
The tail points to the
left
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How can a test's difficulty affect its score distribution?
Easy tests lead to
negative skew
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What happens to the mean in a skewed distribution?
It is pulled towards the
tail
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Where is the median located in a skewed distribution?
Between the
mode
and the
mean
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What are the measures of central tendency in a distribution?
Mode
: Most frequent score
Mean
: Average score
Median
: Middle score
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