The following command

coef$($summary$($reg$5))["$str$",$"Estimate"$]*$sd$($caschool$str$)/$sd$($caschool$testscr$)$

does what?

Group of answer choices

Calculates a LHT for the student teacher ratio in reg$5$

Calculates a hypothesis test for the student teacher ratio in reg$5$

Calculates a null coefficient test for the student teacher ratio in reg$5$

Calculates a standardized coefficient for the student teacher ratio in reg$5$