Unit 1 stats

Marginal relative frequency

Whole table, B/C

Joint relative frequency

Overlap A/C

Conditional relative frequency

1 row or column A/B

Discrete Variable

Countable ex:number of cars or people

Continuous variables

Measurable ex: weight, height, area

Median

Middle number. Use for skewed data. Use in 5 number summary and box plots.

Mean

Average, use if symmetric.

Range

Max subtract min

Describe the distribution

V-variability. Range, IQR, SD

S- Symmetric or skewed, mention gaps

C- center. Median or mean

O- outliers

IQR check

Q3+1.5(IQR) less than max means high outliers

Q1-1.5(IQR) greater than min means low outliers

Cumulative relative frequency

Add the RF in descending order

Z score

Standardized values, SD.( Value-mean)divided by SD