Statistics/ probability help?

Posted on 2017-03-16 18:22:00 in Statistics by RICKY LAU

1. What is an observational study? 
A. 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. 
C. An observational study is a list of all individuals in a population along with certain characteristics of each individual. 

2. What is a designed experiment? 
A. A designed experiment is a list of all individuals in a population along with certain characteristics of each individual.
B. A designed experiment measures the value of the response variable without attempting to influence the value of either the response or explanatory variables. 
C. 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.

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