Test 2/3

what are the 3 discrete distributions

poisson, binomial, geometric

requirements for binomial distribution

n - multiple trials

I - trials are independent

T - possible outcomes for each trial

S - same probability of success

requirements for geometric distribution

I - trials are independent

T - 2 possible outcomes

S - same probability of success

requirements for poisson distribution

T - 2 events can not happen at the same time

I - independent events

R - constant rate

formula for expected mean of a binomial

E(x) = np

formula for expected mean of geometric

E(x) = (1-p)/p

what are the steps of a hypothesis test

hypothesis

formula

Pvalue

conclusion

how to use R code to do a HT

t.test(data,alternative,mu,confidence level)

what is a type 1 error

when test rejects Ho and Ho is true

what is a type 2 error

test does not reject Ho and Ho is false

how to get sample mean from CI

the average (middle)

what does r mean by t value

d value

what does a 90% CI tell us

in 100 intervals the pop mean will be in 90 of them

how to get CI using R

est SD +/- t \* SE

what if 0 is in the CI

there could be no difference

what if 0 is not in the CI

there is a difference between the 2