Hotness Activity

Descriptives! Yay! Inferentials Basic info about sample “Simple” statistics

Frequency n Count of data Number of times something occurs #s or %s

Mean M One type of “average” Measuring “middle” Formula: M = x 1 + x 2 + x 3 + x 4 … sum of scores = 4 n # of scores 4

Variance σ 2 Overall diff from mean of each score “Statistical” (squared) score of how everyone diff. from avg. Formula: For each score, σ 2 = (x – M) 2

Standard Deviation SD Overall diff from mean See if data “normally distributed” Tells us – if sample too diverse to make claims – if measurement flawed Formula But we do it statistically…

Median Mdn Exact middle score Half scores above & half below We’ll do it statistically…

Mode “Pattern” of scores in data Most freq occurring score To get… – Order all units & count whichever most often 4, 7, 10, 2, 9, 8, 2, 4, 4, 7, 9, 12, 11 2, 2, 4, 4, 4, 7, 7, 8, 9, 9, 10, 11, 12 Mode =

Range How “spread out” data are Diff b/w top & bottom scores Formula: Highest score – lowest score 4, 7, 10, 2, 9, 8, 2, 4, 4, 7, 9, 12, 11 Typically report both Range score as well as actual range (“12 was highest, 2 was lowest”)