Final Exam Psychology Statistics Final Exam Questions With 100% Guaranteed Pass.

When do you use a t test? - correct answers When the population SD and variance is unknown You can only calculate z scores when you know the _______. - correct answers population standard deviation Estimated Standard error for single sample t test is the ______. - correct answers Distance between a sample mean and the population mean. If you increase the sample, what happens to the degrees of freedom? - correct answers Increases The ______ the degrees of freedom, the more normal a distribution is. - correct answers HIGHER Assumptions of Independent t-tests - correct answers-Observations within each sample are independent -The two populations from which the samples are selected must be normal -Homogeneity of variance Effect size explains the _______. - correct answersPercentage of variance What would be a small, medium and large effect for r^2? - correct answerssmall=.01 medium=.09 large=.25 Between subjects designs - correct answersSamples come from separate samples Give an example of subjects design. - correct answersComparison of men to women. Repeated measures designs - correct answersTwo sets of data come from the same sample. Give an example of Repeated measures design. - correct answersMeasure a group of patients before and after therapy. 2 Advantages of repeated measures designs - correct answers-Same subjects in all conditions -More likely to find a significant effect because it reduces variance to individual differences Matched subject designs - correct answersIndividuals in one sample are matched with individuals in another sample, so the the two individuals are equivalent on variables In repeated measures designs, the data consists of ____ sets of scores. - correct answerstwo Assumptions for Dependent samples t-test - correct answersObservations are independent within the treatments Give an example of a "Factor" in ANOVA and give the levels of the factor... - correct answers-Training types -3 levels for training When talking about ANOVAS, we use the __________ to describe the design. - correct answersNumber of levels per factor Between treatment variance looks at _______. - correct answersThe difference between group means Within treatment variance looks at _________. - correct answersThe difference within groups Total variability in between treatment variance depends on _____ and _____. - correct answersTreatment effects and chance Total variability in within treatment variance depends on _____. - correct answerschance When the treatment has no effect, the F ratio will be _______. - correct answers1 The farther away the F-ratio is from 1, the greater the ______. - correct answerstreatment effect What 3 things do you need to know to calculate the F-critical? - correct answersAlpha, df between an df total Post hoc tests - correct answersDetermine which mean differences are significant ANOVA compares all _______. - correct answersIndividual mean differences simultaneously Scheffe test - correct answersSafest post hoc test that uses an F-ratio to evaluate significance of the difference between two treatment conditions Advantages of repeated-measures designs - correct answersIndividual differences among participants do not influence outcomes Smaller number of participants needed to test all the treatments Disadvantages of repeated-measures designs - correct answersSome (unknown) factor other than the treatment may cause participant's scores to change Practice or experience may affect scores independently of the actual treatment effect Correlation _________. - correct answers-Measures and describes the relationship between two variables What are the characteristics of correlation relationships? - correct answers-Direction (negative or positive) -Form -Strength Pearson correlation - correct answersmeasures the degree and the direction of the linear relationship between two variables Sum of products measures the _________. - correct answersAmount of co variability between two variables a correlation coefficient measure the degree of ________. - correct answersRelationship on a scale from 0 to 1 Coefficient of determination - correct answersMEasures the proportion of variability Regression - correct answersDefines the line When you have continuous variables, use _____. - correct answersregression Regression=what you are interest in, while Residual=________. - correct answersWhat remains unexplained ______ is a method of finding an equation describing the best fitting line for a set of data. - correct answersRegression Best fit line minimizes ________. - correct answersprediction errors