PSYC 210 Chapter Notes - Chapter 2: Kurtosis, Normal Distribution, Xm Satellite Radio
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Kurtosis how much your graph varies in distribution from the normal curve: peakness, flatness, higher/ower. Equal-interval and ratio variables are the same, except ratio variables have an absolute zero. The difference between two successive categories are the same i. e. , the difference between 1 inch and 2 inches is the same as the difference between 100 inch and 101 inches. This may be mentioned as a clue if a distribution is skewed. ****important to know! i. e. , line up the numbers from lowest to highest, find the very middle value, and that is your median: 5. Add both, divide by the number of values you added (in this case, 2) 5 + 6 = 11 2 = 5. 5 = the median! You can tell by looking at the frequency of the values. Or you can tell by looking at a graph. A graph can have more than one mode . ***measurement variability and mean aren"t dependent on sample size!!!