CRIM 320 Chapter Notes - Chapter 3: Multimodal Distribution, Frequency Distribution, Central Tendency

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**the mode is not the frequency of the most frequency score, but the value of the most frequent score. Some frequency distribuions contain two or more modes. The median: median (mdn) = middle-most point in a distribuion. Posiion of median (n+1)/ 2: if the number of cases is even, the median is always that point above which 50% of the cases fall and below which 50% of the cases fall. Where: x = mean, x = a score value in the distribuion, f = the frequency of occurrence of x, n = the number of scores. Deciding what to apply (median, mode or mean) involves several factors: level of measurement, shape or form of the distribuion of data, research objecive. For this reason, it can only be obtained from ordinal or interval data, not from nominal data: the use of mean is exclusively restricted to interval data.

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