Research Methods: Chapter 10
Terms
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- absicssa
- The horizontal axis of a distribution.
- arithmetic mean
- Aithmetic average.
- asymmetrical distribution
- A distribution of scores in which there is not an exact correspondence in arrangement on the opposite sides of the middle line.
- back-to-back stem-and-leaf chart
- The back-to-back plots of distributions in which the original data are preserved with any desired precision.
- bar graph
- A graphic form for the distribution of data.
- bimodal
- Showing two modes (of a distribution).
- central tendency
- Location of the bulk of a distribution; measured by means, medians, modes, and trimmed means.
- corrected range
- Crude range plus one unit.
- crude range
- Highest score minus lowest score.
- descriptive measure
- Measures such as and that are used to calculate population values.
- interquartile range
- The difference between the 75th and 25th percentiles.
- finite
- Describing the condition in which all the units or events can, at least in theory, be completely counted.
- frequency distribution
- A chart that shows the number of times each score or other unit of observation occurs in a set of scores.
- inferential measure
- Measures such as S and S that are used to estimate population values based on a sample of values.
- infinite
- Boundless, or without limits.
- standard score (z score)
- Score converted to a standard deviation unit.
- line graph
- A line-graph distribution of frequencies of occurerence.
- mean
- The arithmetic average of a set of scores.
- mean square (S ) or MS
- Variance.
- median
- The midmost score of a distribution.
- mode
- The score occuring with the greatest frequency.
- negatively skewed distribution
- An assymmetrical distribution in which the pointed end is toward the left.
- ordinate
- The vertical axis of a distribution.
- outliers
- Scores lying far outside the normal range.
- percentile
- A point in a distribution of scores below which a specified percentage of scores fall.
- positively skewed distribution
- An asymmetrical distribution in which the pointed end is toward the right.
- range
- Distance between the highest and lowest score.
- root mean square
- An index of the variability of a set of daa around the mean values in a distribution.
- stem-and-leaf chart
- The plot of a distribution in which the original data are preserved with any desired precision.
- standard normal curve
- Normal curve with mena = 0 and = 1
- symmetrical distribution
- A distribution of scores in which there is an exacts correspondence in arrangementon the opposite sides of the middle line.
- transformation
- Conversion of data to another mathematical form
- trimmed mean
- The mean of a distribution from which a specified highest and lowest percentage of scores has been dropped.
- unbiased estimator of the population of
- A specific statistic usually written as S
- variance
- The mean ofd the squared deviations of scores from their means in a population or its unbiased estimate.