## Spd 338 test1 part 2

##### Created by:

akl005  on March 21, 2011

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# Spd 338 test1 part 2

 Raw scoreThe number of questions correct. Does not tell you much!
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#### Definitions

Raw score The number of questions correct. Does not tell you much!
Nominal scale A number that identifies (A number on the back of a runner in a race)
Ordinal Scale Listing a rank in order
Interval scale Numbers are ranked and have an equal distance between each number
Ratio scale An interval scale but it has an absolute zero therefore you can do mathematics with it.
Derived scores Scores obtained by using a raw score and expectancy tables.
Standard Scores A derived score that represents equal units within a linear scale.
Measures of central tendency Statistical methods for observing how data cluster around the mean
Normal distribution A symmetrical distribution with a single numerical representation for the mean, median, and mode.
Frequency distribution Method of determining how many times each score occurs in a set of data.
Mode The most frequently occurring score in a set of scores.
Median The middle most score in a set of data
Mean...
Standard Deviation A unit of measurement that represents the typical amount that a score can be expected to vary from the mean in a given set of data.
Measures of Dispersion Statistical methods for observing how data spread from the mean in a given set of data.
Variance Describes the total amount that a group of scores varies in a set of data.
Range The distance between the highest and lowest scores in a data set.
Skewed Describes a distribution that has either more positively distributed scores or more negatively distributed scores.
Positively skewed Describes a distribution in which more of the scores fall below the mean.
Negatively skewed Describes a distribution in which more of the scores fall above the mean.
Percentile Ranks Scores that express the percentage of students who scored as well as or better than a given students score

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