AP Statistics Chapter 1

Relative Frequency

Relative Frequency= Frequency of the event​/ Total number of observations (sum of all frequencies)

Histogram x and y

• On the x-axis: the bins (intervals).

• On the y-axis: the frequencies.

continuos vs discrete

continues is measurable and a fraction and discrete is whole and countable.

marginal relative frequency

% of data in a single row or column compared to the total

joint relative frequency

% of data in a single group compared to the total

conditional relative frequency

% of data in a single category of a GIVEN specific group

quantitative

Context

Shape

Outliers

Center

Spread

what is Q1 2 and 3

1- median of left side

2- median or half

3- median of right side

IQR

Q3- Q1

inter quartile range

low end outlier

any value LESS than Q1 - 1.5 (IQR)

high end outlier

any value MORE than Q3 + 1.5 (IQR)

Z- Score

A number SDs a value is away from the mean

(value - mean)/ SD

add/subtract all values by the same amount

• SHAPE and VARIABILITY stays the same

• CENTER moves up/down by that amount

multiply/divide all values by same amount

• SHAPE stays the same

• CENTER and VARIABILITY gets multiplied/ divided by same amount.