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exam #2

psych 105

TermDefinition
what does the symbol "N" stand for? the number of people in your sample
what is frequency? the number of times a score occurs
what is the symbol for frequency? f
distribution a general term for any organized set of data
what are distributions used for? reporting data and to determine if things are actually different
simple frequency distribution shows the number of times each score occurs in a set of data
steps to make a frequency table 1. make a list of each value from lowest to highest 2. go one by one through each score and tally each time it's repeated 3. make a table representing every time each value is used 4. find the percentage of scores for each value
in a frequency distribution, the sum of the frequencies is always... N
what is cumulative frequency (cumulative f.)? the number of scores up to that point
what is relative frequency (relative f.)? the total number of scores at that frequency that divides the total number of scores in a data set
what is a cumulative percentage? the percentage of scores up to that point
percentiles the percent of all scores in the data that are at or below the score
formula for finding the percentile of a known cumulative frequency percentile/N x 100
what are percentiles usually used for? determining where someone falls in relation to others
what does a frequency distribution graph show? the scores on the X axis and their frequencies on the Y axis
the type of measurement scale, whether it be nominal, ordinal, interval, ratio, etc.) determines whether we use... a bar graph, histogram, or a polygon
nominal or ordinal scores are graphed using a... bar graph
small ratio or interval scales are graphed using a... histogram
large ratio or interval scales are graphed using a... (frequency) polygon
when do you create a bar graph? (hint: something is in one group or the next) when the X variable is discrete
when you are creating a bar graph, histogram, or polygon... consider the scale of measurement of scores on the X axis
Created by: kw3093
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