So keeping in mind the nature of the sample. And the distribution of the variable By calculating the percentage (Percentage) Average (Mean) and standard deviation (Standard Deviation), skewness (Skewnesss), kurtosis (Kurtosis) using a computer program. And hypothesis testing of skewness and kurtosis. Different from zero or not. The test statistic Z (Z-test) by the distribution curve. If the value is zero, SK = 0 indicates that the normal distribution curve. If the value is positive, SK> 0, the curve is skewed to the right, which means the density of the pile is low. And if the value is negative, SK <0, the curve is skewed to the left, which means the density of the pile is high. And bend the normal distribution with the KU = 3, the curve normal distribution model Mesokurtic or bend frequency is high, moderate if KU> 3 shows the curve distribution Leptokurtic or bend frequency with high kurtosis if KU <3. show that the distribution curve Platykurtic
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