Answer: +.01
Explanation:
Correlation research is the research in which experiment is not performed for assessing and studying relationship between variables.No independent variable is altered at such research process.
According to the question, variables that do not form any relation with each other in correlation study is indicated through +.01. Thus, Hui's research that consist variables as height of people and anxiety vulnerability that do not have link with each other. This ,it will be represented through +.01.