stats terms

z tets proptotions follwig assumptionns nneeded

random sample

conditions for binomial expiemtn satisified

nnp> equal to 5 and nq> equal 5

testing the differences between two means

each sample must be indepednnt of the other

the pop must be normally distributed

if variances knwon n must be gretaer than or equal to 30 to use z tets

if varinces unknown or n less than 30 it is a t test

when null rejected

ther eis signficant corelation

direct cuase and effect betwene varibles

reverse cause relatioship

may be caused by third variable

maye be compelxity of interareationship

may be coincidentla

unbiased estimator

expected value of samples of given size equal to parmaetr being estiamted

consistem estimatr

the sample size increases value of the estimator gets closer to vlaue of parmater

relatively efficent estimator

all sattsitcs whcih can be used shoud; have smallest variance

confidence level

proabbilty thta innternal estimator will contaon pramter

point estimate

speciic numeirc value estimate

alpha=

confidennce level

alpahe denotes total area?

yes

alpha/ 2

area of one tail