ENTR 3P99 Chapter 8: Chapter 8
16 Feb 2012
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Chapter 8 normal distribution, probability and statistical significance. Bi-modal distribution: normal distribution or guassian curve. We often possess data from many cases the plot of the distribution often has a bell shape. Many statistical tests require an approximately normal distribution of the data to work properly. A histogram provides one method to examine the distribution. Distribution is bilaterally symmetrical and bell shaped. The mean, median and mode always coincide. Tails of the curve never quite reach the x-axis but extend out to infinity. The range of the effective distribution is 6 standard deviation units. The degree of peakedness is termed kurtosis. Normal distribution symmetrical distribution around the mean. That the distribution of the scores for a variable is normal, The mean value of the scores for the variable, and. Then we can derive other important facts such as: the percentage of values lying between specific points of the curve, and, the probability of a particular value occurring.
