Q8+1_________ involves only two principles viz., the principle of replication and the principle of randomization of experimental designs. It is the simplest possible design and its procedure of analysis is also easier. The essential characteristic of the design is that subjects are randomly assigned to experimental treatments (or vice-versa)Choose one optionCompletely randomized designRandomized block designLatin square designFactorial designs

Formal experimental designs are __________Choose one optionCompletely randomized designFactorial designsRandomized block designLatin square designAll the aboveSave and Next

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

When evaluating complex interventions a stepped wedge design is sometimes used. In a stepped wedge design randomisation is built into:Group of answer choicesThe implementation phasingThe group levelThe individual levelWithin an individual

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

Informal experimental designs are _________Choose one optionBefore-and-after without control designAfter-only with control designBefore-and-after with control designAll the above