Stat chapter 2

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Author:
maryfae
ID:
292902
Filename:
Stat chapter 2
Updated:
2015-01-13 14:39:24
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stat
Folders:
statistics
Description:
chapter 2
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  1. bimodal
    a distribution that has two values that have the highest frequency of scores
  2. distribution
    a collection, or group, of scores from a sample on a single variable. Often, but not necessarily, these scores are arranged in order from smallest to largest.
  3. mean
    The arithmetic average of a distribution of scores
  4. Median split
    Dividing a distribution of scores into two equal groups by using the median scores as the divider. Those scores above the median are the "high" group whereas those below the median are the "low" group.
  5. Median
    The score in a distribution that marks the 50th percentile. This is the score at which 50% of the distribution falls below and 50% fall above.
  6. Mode
    The score in the distribution that occurs most frequently.
  7. Multimodal
    When a distribution of scores has two or more values that have a highest frequency of scores.
  8. Negative skew
    in a skewed distribution, when most of the scores are clustered at the higher end of the distribution with a few scores creating a tail at the higher end of the distribution
  9. Outliers
    Extreme scores that are more than two standard deviations above or below the mean
  10. Positive Skew
    In a skewed distribution, when most of the scores are clustered at the lower end of the distribution with a few scores creating a tail at the higher end of the distribution.
  11. Parameter
    A value derived from the data collected from a population, or the value inferred to the population from a sample statistic
  12. Population
    The group from which data are collected or a sample is selected. The population encompasses the entire group for which the data are alleged to apply.
  13. Sample
    An individual or group, selected from a population, from whom or which data are collected.
  14. Skew
    When a distribution of scores has a high number of scores clustered at one end of the distribution with relatively few scores spread out toward the other end of the distribution, forming a tail.
  15. Statistic
    A value derived from the data collected from a sample.
  16. Σ
    the sum of; to sum
  17. X
    An individual score in a distribution
  18. X
    The sum of X; adding up all of the scores in a distribution.
  19. the mean of a sample
  20. μ
    The mean of a population
  21. n
    The number of cases, or scores, in a sample.
  22. N
    The number of cases, or scores, in a population
  23. P50
    Symbol for the median

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