UBC PSYC 217 Final Exam Questions and Answers Graded A 2024

Attrition - Another word for mortality - People dropping out of studies Informed Consent - Potential participants should be provided with all the information that might influence their decision to participate In what types of research is multiple regression common - Personality, health, and longitudinal developmental research Regression Equation - y = bX + a Multiple Regression - Uses scores on one variable (the predictor) to predict changes in another variable (the criterion) Squared correlation coefficient [r^2] - The amount of shared variance - The % of variance in one variable accounted for by the second variable r value indicates a [Medium] effect/covariation - 0.30 r value indicates a [large] effect/covariation - >0.40 r value indicates a [small] effect/variation - 0.10 - 0.20 Scatterplot - Each pair of scores from a correlation is plotted as a single point on a graph Cohen's d = 1 - The means are separated by 1 standard deviation Cohen's d - Describes the magnitude of the effect of the IV on the DV % of scores fall within 3 SD - 99.7% % of scores fall within 2 SD - 95% % of scores fall within 1 SD - 68% Variability - The spread in a distribution of scores Mean as most useful measure of central tendency - It maximises the use of all data - Can use in statistical analysis Value of central tendency to use when you have [nominal or ordinal variables] - Mode Value of central tendency to use when [outliers] - Median Structural equation modelling - SEM examines models that specify a set of relationships among many variables Yes/No is IV x PV true experimental design - No - Participant variables are not randomly assigned or controlled Statistical analysis to assess the unique contribution of each variable in a correlation - Multiple Regression Discriminant validity - Is the measure not related to what it shouldn't relate to? - The measure should be able to discriminate between the construct being measured and other unrelated constructs