Hotness Activity

Descriptives! Yay!

• Inferentials• Basic info about sample• “Simple” statistics

Frequencyn

• Count of data• Number of times something occurs• #s or %s

MeanM

• One type of “average”• Measuring “middle”

• Formula: M = x1 + x2 + x3 + x4 … sum of scores 4 + 5 + 3 + 4 . = 4

n # of scores 4

Varianceσ2

• Overall diff from mean of each score• “Statistical” (squared) score of how everyone diff.

from avg.• Formula:

For each score, σ2 = (x – M) 2

Standard DeviationSD

MedianMdn

• 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”)