Unit 1: One- Variable Data

AP Stats Unit 1

Individuals

Objects described by data

Variable

Characteristic of Individual

Categorical

Categories + zip codes, of qualitative, but can be quantitative

Numerical

Numbers where arithmetic operations make sense

Distribution

Values of the variable and hor often they occur

SOCS

Spread, Outliers, Center, Shape

5 number summary

Q1, Median, Q3, minimum, maximum

Quartiles

Q1 is at 25%, Q3 is at 75%, IQR is Q1 - Q3

Outliers

More or less than 1.5 IQR from either Q1 or Q3

Standard Deviation

sum of (x-mean)² / n-1

Discrete vs Continuous

Whole numbers vs Decimals & ranges

z- score

x-mean / std deviation

Calculator

normPDF, normCDF, invNorm