part1. A double-blind design is important in anexperiment because there is a natural tendency for subjects in anexperiment to want to please the researcher.
a. True
b. False
part 2.
Sampling error concerns natural variation between samples, andis always present.
a. True
b. False
part 3. Sampling error can only be eliminated when conducting aquestionnaire of students and every question is a closedquestion.
a. True
b. False
