Flashcards in Statistics Alive! Deck (75)

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1

## Kurtosis

### Height of a distribution is affected by too many or too few middle scores

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## Leptokurtic

### A distribution with many middle scores

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## Platykurtic

### A distribution with few middle scores

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## Nominal scale

### Classifies cases into categories

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## Ordinal scale

### Ranks scores by degree to which they possess the measured trait

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## Interval scale

### Distances between adjacent scores are equal and consistent throughout the scale. (equal-interval scale)

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## Ratio scale

### Interval scale with addition of absolute zero point.

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## Continuos variable

### Variables where values could theoretically fall between adjacent scale units (height, weight, time)

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## Discrete data

### Values that cannot theoretically fall between adjacent scale units (people, photos, etc)

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## Real limit

### Half the scale's unit (real limit opposed to observed scores)

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## Frequency table

### Lists each observed score along with number of cases falling at each score

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## Cumulative frequency table

### Shows how many scores are at or below (or at or above) any given score

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## Relative frequency or percentage table

### Gives each score's frequency relative to 100% (values will all be between 0-100).

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## Cumulative relative frequency or cumulative percentage table

### Shows percentage above or below a given score

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## Grouped frequency table

### Frequency table with score intervals. Can show patterns but have to get right size intervals (not too big or small) by guess and check.

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## Percentile rank table

### Indicates percentage of cases falling at or below a given score (not below a given score)

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## Percentile

### The score falling at a particular percentile rank (can be any score on table while percentages will be between 0-100)

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## Stem-and-leaf display

### Hybrid between table and graph with left column indicating first digit of a score and right column indicating every instance of the next digit

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## Abscissa

### X-axis

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## X-axis

### Abscissa

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## Ordinate

### Y-axis

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## Y-axis

### Ordinate

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## Frequency curve or line graph

### Midpoints of data connected by a line without bars

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## Skewed

### Asymmetric distribution with a single peak

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## Negatively skewed

### Many high scores

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## Positively skewed

### Many low scores

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## Bimodal

### A distribution with 2 peaks. Usually an indication that sample contains two distinct subgroups.

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## Rectangular distribution

### Uniform score distribution (like graphing ranks if there are no tied ranks)

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## Bar graph

### Graph appropriate for nominal data with x-axis reflecting categories instead of scores

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