A statistician designs an experiment that tests the effectiveness of a drug. Which process can invalidate the results of the experiment? A. assigning subjects a unique identification number

B. assigning subjects into groups using a randomized process

C. selecting subjects in favor of the treatment

D. selecting subjects randomly for a control group

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

How do i get my dad to stop making me gargle his pickle i want my mom to gargle my pickle not my dads