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3. The lowest score of each class interval should be a multiple of the width.
4. All intervals should be the same width and cover the entire range of scores
with no gaps or overlaps. This way, each score belongs to an interval.
These are ways to document this with graphs
o Height of bar goes with the frequency for the category
o Continuous variables: width extends to the real limits of the
o Discrete variables: each bar extends exactly half the distance to
the adjacent category on each side
• Bar Graphs
• Line Graphs
Symmetrical Distribution: When it is possible to draw a vertical line through
the middle so that both sides are equal (A normal distribution bell curve)
Skewed Distribution: Scores are more on one end of the graph than the other
Tail: The section of scores that taper off to one end
Positively Skewed: When the tail is on the right hand side of the distribution
Negatively Skewed: When the tail is on the left hand side of the distribution Rank/Percentile Rank: Determined by the number of individuals that scored
the same or le...
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This note was uploaded on 01/27/2014 for the course PSYCH 248 taught by Professor Rossihassad during the Spring '13 term at CUNY Hunter.
- Spring '13