PSYC 60 Chapter Notes - Chapter 3: Frequency Distribution, Level Of Measurement, Weighted Arithmetic Mean
Document Summary
3-1 defining central tendency: central tendency attempts to determine the single value, usually located in the center of a distribution, that is most representative of the entire set of scores. Average : useful for making comparisons between groups of individuals or between sets of figures; makes large sets of data easier to comprehend, no single measurement produces a central value in every situation. 3-1a three measures of central tendency: mean, median, and mode. 3-2b the weighted mean: often necessary to combine two sets of scores and find the overall mean. Need the overall sum of the scores for the combined group and the total number of scores in the combined group. Not halfway between the original 2 samples because samples aren"t the same size. 3-2c computing the mean from a frequency distribution table: find the sum of the scores by computing fx, find n by adding all the frequencies, m= x/n. Common for changing the unit of measurement.
