In a randomized controlled trial, the purpose of "double blinding" or "double masking" is to _______________________________________________________________________ a. ensure that the participants are not aware as to whether they are in the treatment group or in the control group b. ensure that the investigators are not aware of which participants are in the treatment group and who are in the control group c. to ensure that the independent statisticians are also unaware of which participants are in the treatment group and who are in the control group d. both a and b e. both b and c f. both a and c g. all of the above

In a randomized controlled trial, the purpose of "double blinding" or "double masking" is to _______________________________________________________________________ a. ensure that the participants are not aware as to whether they are in the treatment group or in the control group b. ensure that the investigators are not aware of which participants are in the treatment group and who are in the control group c. to ensure that the independent statisticians are also unaware of which participants are in the treatment group and who are in the control group d. both a and b e. both b and c f. both a and c g. all of the above

	a.	ensure that the participants are not aware as to whether they are in the treatment group or in the control group
	b.	ensure that the investigators are not aware of which participants are in the treatment group and who are in the control group
	c.	to ensure that the independent statisticians are also unaware of which participants are in the treatment group and who are in the control group
	d.	both a and b
	e.	both b and c
	f.	both a and c
	g.	all of the above