Stats Flashcards
what is Independent T test
ran when we have two separate groups of people
what is Paired T
compare the means of two related groups. Controlled and not controlled
what is One sample T
target number, not given a standard deviation
what is z test
has the standard deviation
test assumptions
roughly equal group sizes
normality
independent groups
homogeneity of variance
equation for z test
x̄ - M / (sigma/sqrt(n))
equation for one sample t test
t =x̄ -M /Sm
equation for independent t
m1-m2 / sm1 - m2
equation for paired t
t = Md - sigma /(s/sqrt(n))
One sample t proof
H0: µcondition = pop mean
H1: µcondition =/ (condition)
independent t proof
H0:µcondition - µcontrol = 0
H1: µcondition - µcontrol =/ 0
Paired t test proof
H0: µcondtion =0
H1: µcondition =/ 0
z test hypothesis
H0: µcondition = pop mean
H1: µcondition =/ (condition)
pooled variance
sp^2 = (ss1+ss2)/(df1+df2)
positive kurtosis
too much info is close to the mean
