One
What does Alpha mean?
the probability that the result will fall in the rare zone.
standard deviation
a measure of variability for interval or ration data
degrees of freedom
the number of values in a sample that are free to vary
effect size
a measure of the degree of impact of the explanatory variable on the outcome variable.
significance level
the probability of a type I error
What is a treatment effect?
the impact of the explanatory variable on the dependent variable.
predictor variable
the variable in a relationship test X that predicts Y
mean
an average calculated for an interval or ratio scale
dependent variable
the variable where the effect is measured.
post hoc test
a follow up test to statistically significant ANOVA
What is range?
A measure of variability for an interval
deviation score
a measure of how far away a score falls from the mean.
percentile rank
percentage of cases with scores at or below a given level in a frequency distribution
independent t-test
an inferential statistical test used to compare two independent samples.
beta
the probability of making a Type II error
What are Ordinal level numbers?
numbers used to indicate if more or less of an attribute is possessed.
hypothesis
a proposed explanation for observed facts.
z score
raw score expressed in terms of how many standard deviations it falls away from the mean.
main effect
the impact of an explanatory variable by itself on the outcome variable.
descriptive statistic
a summary statement about a set of cases.
critical value
the value of the test statistic that forms the boundary between the rare zone and the common zone.
between subjects
independent samples
Cohen's d
a standardized measure of effect used to measure the difference between means.
median
an average calculated by finding the score associated with the middle case.
type II error
the error that occurs when one fails to reject the null hypothesis but should have rejected it.