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20 Cards in this Set
- Front
- Back
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Methods of organizing, summarizing and presenting data in an informative way. Ex. average |
Descriptive Statistic |
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Methods used to determine something about a population, based on a sample |
Inferential Statistic |
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A randomly selected portion of a population |
Sample |
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Refers to a sample of a population |
Statistic |
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Refers to the whole population |
Parameter |
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A survey of all the members of the population. The values from this would be considered parameters |
Census |
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Variables in which not all values are possible |
Discrete |
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Variables in which an uninterrupted range of values are possible. Ex. real numbers |
Continuous |
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Data that cannot be ordered (name only) |
Nominal |
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Data that includes order |
Ordinal |
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Data that is numerical |
Interval |
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Data that can be used in a sentence (meaningful zero) |
Ratio |
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A table that displays the frequency of various outcomes in a sample. |
Frequency Distribution |
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Halfway between the lower limits of two consecutive classes. It is computed by adding the limits of two consecutive classes and dividing the result by two. |
Midpoint |
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You can find this by finding the difference between two consecutive midpoints, or by subtracting the lower limit of one class from the lower limit of the next class. |
Class Interval |
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A chart with gaps vs. a chart without gaps |
Bar graph vs. Histogram |
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The arithmetic mean of the squared deviations from the population mean. The symbol is sigma squared. |
Population variance |
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The square root of the population variance. The symbol is a sigma. |
Population standard deviation |
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Requires a change in the denominator. Similar to population variance & the symbol is s^2. |
Sample variance |
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The square root of the sample variance. The symbol is s. |
Standard sample deviation |
