# 301-2meanmedmod

## 12 terms

### mode

most frequently observed value of a variable

### how to obtain mode

complete a frequency count

simple and easy to calcualte

frequently distorts the location of the middle of the data

### median

50th percentile of the data; middle of the data; one half of the scores are larger than the median and the other half are smaller

### how to obtain median

array the scores vertically in rank order from highest to lowest-->begin at the top of the array and count down halfway; if N is odd, the median will be the discrete score exactly in the center of the data, if N is even, the median is the arithmetic mean of the two center scores

cannot be used to calculate an index of spread of dispersion because scores are converted into ranks and not original unit

extremely robust descriptive index (estimate of the middle)

### mean

arithmetic mean; "balance point" of the data; most frequently used and most important use in central tendency

### how to obtain mean

sum of a set of scores or observations divided by the number of scores in the set