stats 1-3

collection of observable things

can be arranged (ordered) but can’t be determined ex: age

data that can be described with names/data/categories ex:eyecolor

population

numerical measurement that describes some characteristic of a population

measurement (numerical) of a population of a sample

divide population into subgroups based on a characteristic, and a sample is drawn from each subgroup

human error

problem with how the sampling was conducted

taking the data at a single point in time

data collected from

the past and analyzed

data shared in the future from groups that share common factors

variable measured in numerical quantities

freq for a class/sum of all frequencies

mean>median

mean<median

mean ≈ median

#of values less then x

—————————————- * 100

total #of values

first quartile p25

second quartile/median

third quartile

any data outside of the range

Q1-(1.5)(iqr)

Q2+(1.5)(iqr)

Q3-Q1

#of times occurred/#of times procedure repeated

P[B or A] = P(A)+ P(B)-P(A and B)

A happens and then B happens

P(A and B)= P(A)• P(B|A)