Purdue PSY 203 Exam #2 || with A+ Guaranteed Solutions.
independent variable correct answers what the researcher manipulates; the "factor"
dependent variable correct answers what the researcher measures
operational definitions correct answers a definition of a concept or variables in terms of precisely
described operations, measures, and procedures
control variables correct answers variables held constant or equated across groups or conditions
random selection correct answers each member of a group stands an equal chance of being
chosen as a participant in the study
simple random assignment correct answers use of chance procedures so that each participant is
equally likely to be in any condition
blocked random assignment correct answers -procedure used in between-subjects design for
random assignment and equal # of participants per condition
-ensures that a conditions has a participant assigned to it before adding another
what is a confound? correct answers something else besides the IV which systematically varies
across groups
what are extraneous variables? correct answers variables not of interest but (if left free to vary)
could affect the results
what are the three characteristics of a true experiment? correct answers manipulation: researcher
determines what each participant receives and when
comparison: treatment of interest contrasted with a reference group or condition
control: minimize or eliminate influence of extraneous variables
posttest only design correct answers -has two groups
-uses a post-only measure
-has two distributions (measures), each with an average and variation
-assess treatment effect = statistical (i.e., non-chance) difference between the groups
-no independent variable
pre-post (before-after) design correct answers -no independent variable
-uses two groups (one treatment and one control)
-test before and after the condition has been administered
-both undergo exactly the same tests
-has issues with history
pre-post design with nonequivalent control group (quasi experiment) correct answers -two
groups that are not randomly assigned to the conditions
independent variable correct answers what the researcher manipulates; the "factor"
dependent variable correct answers what the researcher measures
operational definitions correct answers a definition of a concept or variables in terms of precisely
described operations, measures, and procedures
control variables correct answers variables held constant or equated across groups or conditions
random selection correct answers each member of a group stands an equal chance of being
chosen as a participant in the study
simple random assignment correct answers use of chance procedures so that each participant is
equally likely to be in any condition
blocked random assignment correct answers -procedure used in between-subjects design for
random assignment and equal # of participants per condition
-ensures that a conditions has a participant assigned to it before adding another
what is a confound? correct answers something else besides the IV which systematically varies
across groups
what are extraneous variables? correct answers variables not of interest but (if left free to vary)
could affect the results
what are the three characteristics of a true experiment? correct answers manipulation: researcher
determines what each participant receives and when
comparison: treatment of interest contrasted with a reference group or condition
control: minimize or eliminate influence of extraneous variables
posttest only design correct answers -has two groups
-uses a post-only measure
-has two distributions (measures), each with an average and variation
-assess treatment effect = statistical (i.e., non-chance) difference between the groups
-no independent variable
pre-post (before-after) design correct answers -no independent variable
-uses two groups (one treatment and one control)
-test before and after the condition has been administered
-both undergo exactly the same tests
-has issues with history
pre-post design with nonequivalent control group (quasi experiment) correct answers -two
groups that are not randomly assigned to the conditions
