Question

​When neither the participants nor the experimenters know which group has received the treatment and which has received a placebo, the design is called __________.A. confounding.B. double-blind.C. correlational.D. naturalistic.E. retrospective.

Answer 1

B. double-blind

Step-by-step explanation:

Double - blind design -

It is the type of study , where both the experimenters and the participants are completely unaware about the treatment , is referred as double - blind design .

This method enables to remove any type of discrimination about the treatment or activity.

Hence, from the given information of the question,

The correct option is B. double-blind design .

Answer 2

The correct answer is option B. double- blind.

Step-by-step explanation:

A single blind study or experiment, in which there is participants do not know the what treatment get during the experiment while the experimenters know about the treatment and records data.

In double blind study or research it is a design there is neither experimenters nor the participants know what experimental treatment is given or which when is given control treatment or received a placebo.

Thus, the correct answer is option B.