why use joint test in regression what is the difference between a hat and a beta which of the following is the correct test to use? what is the joint test of $hat_beta_2 what is the function of $hat_beta_epsilon$ for the independent variable? what is the d_i$ of a joint test? what is the sample size of each group what is hat beta_i$ what is the difference between a joint test and a logistic regression? how to incorporate the sample groups how to incorporate sample groups in regression what is the coefficient of the independent variable x how to integrate sample groups why use joint test which test should use for incorporating sample groups? what is the coefficient of the independent variable in the joint statistic? which test will be performed with three independent variables combining the three sample groups in the regression how to incorporate sample groups how to incorporate sample group which test is used for combining pairs of sample terms