ap statistics unit 6

interpretation of mean

after many many “context” was sampled/randomly assigned, the average # of “context” is approximately _____

standard deviation of discrete random variable interpretation

the “context” typically varies by approximately # from the mean of #

discrete random variables

gaps and integers

continuous random variables

decimals, all possible values

describing shape of distribution

slightly/roughly “shape” with peaks at ___

how does + and - affect mean and standard deviation

only mean

how does x and / affect mean and sd

affects both

if x and y are independent, how is variance affected

normal model steps

1. z score

2. model

3. interpretation

interpretation of normal model

according to the normal model, there is approximately an ___% chance that “context”

binomial acrnonym

BINS

BINS

binary → success or failure

independent of each other trial

number of trials is fiexed

s → fixed probability of success

binomial probability formula

mean of binomial

np

standard deviation of binomial

10% condition

n<0.1N

large counts condition

geometric distribution acronym

BITS

BITS

binary → success or failure (say specifically)

independent of each other

trials until success

fixed probability of success

geometric probability formula

mean of geometric distribution

standard deviation of geometric

greater than geometric probability