4.8 - Com 300 4.8.10 Review Descriptive Statistics Two...

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Com 300 4.8.10 Review Descriptive Statistics Two Areas: Central tendency and variability/dispersion Notes Centrality: Mean median mode Dispersion: Range Dispersion: refers to the spread of the values around the central tendency 1. The range - subtracting the lowest score from the highest score. a. Example: Test scores high = 98, low = 62 What is the range? 36 -for the most part, a set of data will result in a bell curve when scores or data are plotted. Greek letters you ought to know with statistics Set of scores = X Number of events = n or N Summation = E Arithmetic mean (average) μ = population (MU) m or x = sample mean Standard deviation S = sample standard deviation σ = population standard deviation Dispersion (continued) 2. The standard deviation is a measure of how much scores differ (vary)( from the mean of the scores a. Tells you what your data really looks like using normal distribution principles a.i. Dispersion points closer to the mean = a smaller standard deviation a.ii. Dispersion points or data points far from the mean = larger
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4.8 - Com 300 4.8.10 Review Descriptive Statistics Two...

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