AP stats unit one

discrete

counting

continous

measuring

determining intervals for histograms

range/class size

finding percentile

number of values/ total number of values x 100

countinous graphs

• histograms

• ogives

discrete graphs

• bar charts

• dot plots

• stemplots

mean

• add up all values in data set and divide by total number of values

• used with symmetric and non-skewed

• use standard deviation

median

• order smallest to largest and find middle value

• with odd number of values, median will be the middle number

• with even numbers, median will be the mean of two middle value

• use IQR

• used with skewed distributions

range

maximum- minimum

standard deviation

• only use as measure or spread when using mean

• always +

• 0 when all values are the same

q1

25%

q2/median

50%

q3

75%

Things to have when describing quantitive data

• shape

• outliers

• center (mean or median)

• spread (IQR or standard deviation)

unimodal

one peak

bimodal

two peaks

uniform

data has the same values across

symmetric

if split in half it shows a mirror image