What is an observational study What is a designed experiment Which allows the researcher to claim causation between an explanatory variable and a response variable What is an observational study OA An observational study is when a researcher assigns individuals to a certain group intentionally changing the value of an explanatory variable and then recording the value of the response variable for each group B An observational study measures the value of the response variable without attempting to influence the value of either the response or explanatory variables OC An observational study is a list of all individuals in a population along with certain characteristics of each individual What is a designed experiment OA A designed experiment is when a researcher assigns individuals to a certain group intentionally changing the value of an explanatory variable and then recording the value of the response variable for each group OB A designed experiment measures the value of the response variable without attempting to influence the value of either the response or explanatory variables OC A designed experiment is a list of all individuals in a population along with certain characteristics of each individual