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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