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21 Cards in this Set
- Front
- Back
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Name five descriptive techniques
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1. Tables
2. Frequency Distribution 3. Frequency Polygon 4. Measures of Central Tendency 5. Measures of Variability |
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What type of data can be organized in a Frequency Polygon?
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Ordinal, Interval or Ratio
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A normal curve is _______, _________, and defined by a ___________.
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a. Symmetrical
b. Bell-shaped c. specific mathematical formula |
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Define Kurtosis
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Relative peakedness (height or flatness) of a distribution.
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Leptokurtic
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When a a distribution is more peaked than the normal distribution.
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When a distribution is flatter, it is called ______________.
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Platykurtic
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In a _________________ distribution, more than _________ of the observations fall to one side of the distribution and relatively few fall in the tail on the other side of the distribution.
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a. Skewed
b. half |
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Measures of Central Tendency
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Mean
Median Mode |
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What measure of central tendency is used for a Nominal scale of measurement?
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Mode
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The _____________ (scale of measurement) is often used when the distribution is very skewed or when there is missing data.
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Median
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In a _________ skewed distribution, the mean is greater than the median which is greater than the mode.
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Positively
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In a negatively skewed distribution, the __________ is greater than the median, which is greater than the mean.
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Mode
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Measures of variability
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1. Range
2. Variance 3. Standard Deviation |
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Range
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Calculated by subtracting the lowest score in the distribution from the highest score.
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The ________ is a more thorough measure of variability than the range.
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Variance or Mean Square
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The variance provides a measure of the average amount of ___________ in a distribution by indicating the degree to which the scores are dispersed around the distributions mean.
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variability
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How is the standard deviation calculated?
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by taking the square root of the variance.
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When a distribution is normal, ______% of the scores fall between that are plus and minus one standard deviation of the mean. __________ of the scores fall between the scores that are plus and minus two standard deviations from the mean and ____________of the scores fall between the scores that are plus and minus three standard deviations from the mean.
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a. 68.26 (+- 1 SD)
b. 95.44 (+- 2 SD) c. 99.72 (+- 3 SD) |
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The simplest measure of variability is the __________.
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Range
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When a constant is __________ or
-------------- to each score in a distribution, the measures of central tendency change but the measures of variability stay the same. |
Added
Subtracted |
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When each score is multiplied or divided by a constant the ____________ and ___________ change.
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Measures of central tendency
variability |
