4. Mrs. Smith wants to find out whether people with dogs are happier than those without. Relate the following terms from this unit: Operational Definitions Random Assignment Control Group Experimental Group Independent Variable Dependent Variable Confounding/Lurking Variables Blind/Double Blind Study 5. Statistics and data are important to understand for the AP Exam. Review what the following mean in relation to IQ scores. Measures of Central Tendency 68-95-99 Rule Standard Deviation Statistical Significance p Value (