# PSY571_Ch2_Glossary

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } Frequency Distribution A tabulation of the number of occurrences of each score value. An organized tabulation of scores or categories and the number of times they appear in a given population or sample. Relative Frequency The proportion of observations in the distribution at that score value. The number of occurrences of a particular score value in relationship to the total score value. Relative Frequency Distribution A listing of the relative frequencies of each score value. Cumulative Frequency Distribution A tabulation of the frequency of all measurements at or smaller than a given score value. Used to help calculate percentiles. Cumulative Relative Frequency Distribution A tabulation of the relative frequencies of all measurements at or below a given score value. This is used to directly calculate percentile ranks. Class Interval A range of score values. A group of score values that is used to help summarize data that contains many different score values. Grouped Frequency Distribution A tabulation of the number of measurements in each class interval or the number of occurrences of scores that fall in each class interval. Abscissa x-axis or the horizontal line. Often marked in units of the variable being measured. Ordinate y-axis or vertical line. Often marked in units of frequency or relative frequency. Relative Frequency Histogram A type of frequency distribution graph that uses the heights of bars to represent relative frequencies of score values or class intervals. Discrete variable A type of variable in which no values can exist between two adjacent scores or values. Continuous variable A type of variable in which an infinite number of values can exist between any two scores. Symmetrical Distribution A type of distribution where if it is divided in half, the two halves are mirror images of each other. Positively skewed distribution A type of distribution in which the tail of the graph points towards the right hand side or the side with the higher scores. Negatively skewed distributions A type of distribution in which the tail of the graph points to the left hand side or the side with the lower values of a score. Unimodal, Bimodal, Multimodal Distributions Distribution with one peak or mode. Distribution with two peaks or modes. Distribution with more than two peaks or modes. Central Tendency of a Distribution A score value near the center of the distribution; it is supposed to be a typical or representative score value. Often measured as the mean, median, or mode. Variability The degree to which the measurements in a distribution differ from one another. A measurement of how clustered or scattered the scores are in a given distribution. Percentile Rank The percent of measurements in the distributions below that score value. Percentiles The score value with P% of the measurements in the distribution. Not sure if this refers to the actual score or the percentage still. .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } Authordarwinguevarra ID62549 Card SetPSY571_Ch2_Glossary DescriptionCh. 2: Frequency Distributions and Percentiles Updated2011-02-22T18:27:50Z Show Answers