stats exam 2

type 1 error

rejecting the null hypothesis (Ho) when it is true

internal validity

assesses the degree of confidence that a causal relationship being tested is trustworthy and not influenced by other factors or variables

sum of squares (ss)

sum of squared deviations from the mean

face validity

form of validity that is demonstrated when a measure superficially appears to measure what it claims to measure

type 2 error

failing to reject the null hypothesis (Ho) when it is false

external validity

assess the degree to which findings of a study can be generalized to other populations or settings

s

average deviation from the mean

construct validity

form of validity that is demonstrated when scores obtained from a measure are directly related to the variable itself

power

probability of correctly rejecting the null hypothesis when it is false

random error

cases which have an unpredictable influence on our measurements

s hat

best estimate of the population standard deviation

convergent validity

form of validity that is demonstrated when scores obtained from a new measure are directly related to scores obtained from a more established measure of the same variable

independent groups t-test

• iv is between subjects

• iv has 2 levels

• dv has to be quantitative

correlated groups t-test

• iv is within subjects

• iv has 2 levels

• dv is quantitative

one-sample z-test

• know sigma

• quantitative variable

• interval, ratio (Xbar→M)

one sample t-test

• quantitative variable

• Xbar→M