Flashcards in Statistics Alive! Deck (75)
Height of a distribution is affected by too many or too few middle scores
A distribution with many middle scores
A distribution with few middle scores
Classifies cases into categories
Ranks scores by degree to which they possess the measured trait
Distances between adjacent scores are equal and consistent throughout the scale. (equal-interval scale)
Interval scale with addition of absolute zero point.
Variables where values could theoretically fall between adjacent scale units (height, weight, time)
Values that cannot theoretically fall between adjacent scale units (people, photos, etc)
Half the scale's unit (real limit opposed to observed scores)
Lists each observed score along with number of cases falling at each score
Cumulative frequency table
Shows how many scores are at or below (or at or above) any given score
Relative frequency or percentage table
Gives each score's frequency relative to 100% (values will all be between 0-100).
Cumulative relative frequency or cumulative percentage table
Shows percentage above or below a given score
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.
Percentile rank table
Indicates percentage of cases falling at or below a given score (not below a given score)
The score falling at a particular percentile rank (can be any score on table while percentages will be between 0-100)
Hybrid between table and graph with left column indicating first digit of a score and right column indicating every instance of the next digit
Frequency curve or line graph
Midpoints of data connected by a line without bars
Asymmetric distribution with a single peak
Many high scores
Many low scores
A distribution with 2 peaks. Usually an indication that sample contains two distinct subgroups.
Uniform score distribution (like graphing ranks if there are no tied ranks)
Graph appropriate for nominal data with x-axis reflecting categories instead of scores