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19 Cards in this Set
- Front
- Back
Bimodal distribution
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A distribution with two modes
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Correlation
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The relationship between two variables
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Correlation coeffecient
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A numerical value that expresses the degree of relationship between two variables. Ranges from -1 to +1. -1 to 0 indicates a negative correlation and 0 to +1 indicates a positive correlation except that 0 represents no correlation whatsoever
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Descriptive Statistics
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Statistics that describe and summarize data in a meaningful fashion
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Frequency distribution
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Expresses how often a score occurs in a set of data
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Interval scale of measurement ****
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An interval scale is one in which equal differences in scores represent equal differences in amount of pthe property measured but with an arbitraty zero point. *** example: Fahrenheit scale of measurement- 20 degrees isn't twice as hot as 10 degrees and 0 does not mean there is no temperature.
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multimodal distribution
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A distribution with three or more modes
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Negative correlation
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an inverse relationship: variables are said to be negatively correlated when a high score on one is accompanied by a low score on the other (one goes up, the other goes down.)
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Negatively skewed distribution
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A distribution in which more of the scores fall above the mean than below it
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Nominal scale of measurement
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Nominal data are categorical data. Assigning observations into various independent categories and then counting the frequency of occurence within each of the categories creates a nominal scale- it has no inheirit value, it is just a label
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Normal distribution
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Represents the way the scores would fall if a particular test is given to every single student of the same age or grade in the population for whom the test was designed (this is the goal of test makers- for scores to form a normal distribution, which follows the theoretically perfect bell curve)
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Ordinal scale of measurement
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Ordinal scales involve the rank order system. It is a scale in which scores indicate only relative amounts or rank order.
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Positive correlation
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a direct relationship: variables are said to be positively correlated when a high score on one is accompanied by a high score on the other. Conversely, low scores on one variable are associated with low scores on the other ( as one goes up, the other goes up)
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Positively skewed distribution
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A distribution in which more of the scores fall below the mean than above it
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Ratio scale of measurement
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A scale having interval properties except that a score of zero indicates a total absence of the quality being measured. A scale of zero means zero. (ex distance, weight, etc)
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skewed distribution
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a distribution in which the majority of scores falls at either the high end or the low end rather than the middle of the distribution
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standard deviation
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the spread of scores around the mean
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variance:
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a statistical concept that tells the spread of scores within a distribution
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zero correlation
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no relationship between the variables, so that a change in one is not associated with a change in the other
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