A study is designed to test the effectiveness of a program to teach adolescents about nutrition. All research participants are randomly assigned to two groups, one which goes through the program and the other which does not. Both before and after the program, all participants take a test measuring knowledge of nutrition. What type of experimental design is this? A. posttest-only control group design B. pretest-posttest control group design C. 2 × 2 factorial design D. 2 × 4 factorial design

Which experimental design includes a pretest and post-test measurement for both the control and experimental groups?Review LaterPost-test only designRandomized Control Trial (RCT)Solomon four group designFactorial design

A design in which different subjects take part in each condition of the experiment is referred to as _______________ A. factorial design B. between-subject design C. pretest-posttest design D. within-subject design

Which experimental design compares the outcomes of a treatment group to a non-randomly assigned control group?Review LaterPost-test only designPretest-post-test only designNon-equivalent control group designTime series design

Which of the following is an extremely important design element to have in an experimental study? Check all that apply. Treatments that are imposed by the experimenter A placebo Groups which are exactly the same size Randomized selection of participants

Participants who experience anxiety are placed into two groups for a research experiment. They are separated into groups based on age. Those who are 30 and over go into one group and those under 30 into another. What type of design would this be considered? Group of answer choicesMatched design Quasi-experimental design Masked design Mixed design