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# 11 - much overlap there is between scores from different...

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1/31/11 Minimum Requirements for a Graph o Title o X-axis label o Y-axis label o Units for X and Y axes o Error bars- usually standard errors Adds variability information to the central tendencies you present o Legend, if necessary o Caption explaining what the graph depicts Frequency Distribution o Represents how frequently scores occur o Shows the frequency of scores within each class interval Class interval-Range of numbers that you will sum the frequency of occurrences within Ex: The number of scores within each 5-point interval o Must have 10 to 20 class intervals Cumulative Freq. Dist. o Begin with lowest class interval Cumulative freq. is the freq. of all occurrences below each bin. Average Value o Set of data that is generally in the middle of the freq. histogram o Plotting the histograms of two sets of data allows you to visualize how
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Unformatted text preview: much overlap there is between scores from different sets of data o Lots of overlap- the groups are probably not different o Little overlap- the groups are significantly different • Skewness o A measure of the lack of symmetry of a distribution o Positive Skew- there are a large proportion of lower occurrences o Negative Skew- there are a large proportion of positive occurrences • Skewness Normalized o Sk=3(mean[or xbar]-median)/s • Variability o The wider the graph the more variability (on a histogram) • Kurtosis o Mesokurtic- normal distribution, no kurtosis o Luptokurtic- Skinny- less dispersion of scores o Platykurtic- Fat- more dispersion of scores Closer to a uniformal distribution...
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