Survey Test Welcome to your Employee Survey In experimental design, a(n) ________________ represents a variable whose effect we are interested in estimating with minimum variance. independent variable treatment variable dependent variable random variableTo test autocorrelation, the following test can be used: Z-test t-test Durbin-Watson None of the aboveA dummy variable is used as an independent variable in a regression model when the variable involved is numerical. the variable involved is categorical. when two independent variables interact. None of the above