Factorial designs are classified as ____ designs

You have designed an experiment to test a new drug

You prepare the injection doses of the drug and a placebo and label them with different alphabet letters. Then, you hire research assistants to give the injections and to collect data from the participants. These research assistants as well as the participants will not know which injection is the drug or which is the placebo or whether a participant is in the experimental or the control group. You have a. created a placebo effect. b. designed a single-blind experiment. c. designed a double-blind experiment. d. created a self-fulfilling prophecy.

In surveys conducted the week after an election, more people will say they voted than actually did, indicating a courtesy bias

Indicate whether this statement is true or false