one way independant lec 1 Flashcards
what does ANOVA stand for
analysis of covariance
when is a t-test used
when there are less than 2 levels in one way indep groups
what does ANOVA tells us
the probability of observing the pattern in the group when the null hypothesis is true
what is variance also known as
sum of squares (ss)
what is within subjects variance
random difference, not interested in
what is between subjects variance
explained by membership of the experimental group, interested in it
how do you calculate mean square within
SS / DF (no of participants - 1)
how do you calculate mean square between
SS / DF (no of levels - 1)
what is another name for within subjects variance
error variance
how do you calculate the f value
MS between / MS within
what type of test is ANOVA
inferential test
how do you calculate variance (ss)
difference of score and mean 2 then all added up
what is F value is close to one
there is no diference, about the same
what is F value is close to 100
suggesting that there is ‘eg 99’ % variance between and that there is an effect so reject null hypothesis
what is P value
the probability that f value occurring if the null hypothesis is true
what would a p value of 0.001 suggest
there is 1 in 1000 chance to find an F value larger is the null hypothesis is trure. suggests that the hjull is probably not ture
what happens if ANOVA is significant
post hoc test
what does a post hoc tell us
how there is a difference
what does a post hoc test do
compares each pair of condition means
what does a post hoc test increase the chance of
type one error (false positive)
what does a bonferroni correction do
splits the 5% chance of type one error across all of the post hocs
what is the structure for writing up the analysis of a one way independant
study design, on what topic?
what did ANOVA reveal for the topic?
post hoc and explain bonferroni and its value
post hoc for first group
post hoc for second
post hoc for third
what do these test suggest for the topic?
what row in SPSS relates to within variance
error
what row in SPSS refer to between variance
below intercept, includes the two conditions… eg caffine_dose
what does an SPSS value of .000 mean
p<.001
what is the layout for the ANOVA result using SPSS table
f(DF1,DF2)= F, P=pvalue
