Unit 5 Quantatative Data

dotplot

-easy to make

shows ALL data and key features

-Not Useful for larger data sets OR if there is NO repeated values (little repetition)

stemplot

shows groupings of data

-helps if there is NOT a lot of repeated values

split stemplot

just gives more of a breakdown of the data

Histogram

Groups data to show pattern

*Not ALL data is visible

Bin Width (histograms)

Spacing on the X-axis

mean

Average

median

“middle” *odd # (n) of data N+1 /2 + location of median

*Even # (m) of data M /2 = avg that location is next

Mode

Most Occuring

Standard Deviation

Sx Average distance to mean

Variance

(sx)2, S2x= total dist. to mean

Spread

min to max

range

max-min

IQR

q3-q1

SOCS

Shape, Outliers, Center, Spread

Shape

“skewed left” “skewed right:” approx. symm.”

Outliers

Unusual Features

Data that is really different from the rest

Gaps/multiple breaks

Center

Or median

MEAN

Spread

Stand. dev, spread, range, IQR