A. What would it look like to design a posttest only experiment (a A. What would it look like to design a posttest only experiment (a design where participants are randomly assigned to independent variable (the manipulated variable) groups and are tested on the dependent variable once) that would test each of the following casual claims. For each one, identify its dependent variable(s) [the measured variable], and suggest some important control variables (any variable that an experiment holds constant on purpose). Then sketch a bar graph of the results you would predict (remember to put the dependent variable on the Y axis). Finally, apply the three causal criteria (1. Corvariance, do the results show that the casual variable is related to the outcome variable? Are distinct levels of the independent variable associated with different levels of the dependent variable? 2. Temporal precedence, does the study design ensure that the casual variable comes before the outcome variable in time? 3. Internal validity, does the study design rule out alternative explanations for the results?) to the study. Having a friendly (versus a stern) teacher for a brief lesson causes children to score better on a test of material for that lesson.Social SciencePsychology PSYC 310
