In Exercises 33–36, identify which of these designs is most ap...

Question

In Exercises 33–36, identify which of these designs is most appropriate for the given experiment: completely randomized design, randomized block design, or matched pairs design.

West Nile Vaccine Currently, there is no approved vaccine for the prevention of infection by West Nile virus. A clinical trial of a possible vaccine is being planned to include subjects treated with the vaccine while other subjects are given a placebo.

Accepted Answer

Hello everyone. Let's take a look at this question together. Which of these designs is most suitable for the given experiment? And the given experiment is a flu vaccine study where a new flu vaccine is being tested in a clinical trial. Participants are randomly assigned to either receive the vaccine or a placebo, and the infection rates are later compared between the two groups. Is it answer choice? A completely randomized design? Answer choice B, randomized block design, answer choice C, matched pairs design, or answer choice D, none of these. So in order to solve this question, we have to recall what we have learned about each of the following types of experimental designs to determine which is most suitable for this given experiment. Well, starting off with answer choice A, which says completely randomized design, we know that. Completely randomized design is a type of experimental design where subjects are randomly assigned to treatment groups without prior grouping. Then we have answer choice B, which is randomized block design, which we can recall that a randomized block design is a type of experimental design where subjects are divided into blocks based on characteristics such as age or health status before random assignment. And lastly, we have answer choice C, which says matched pairs design, which we know that a matched pair's design is a type of experimental design where each subject is measured before and after the treatment or paired with a similar subject. So now that we have recalled the characteristics about each of the following types of experimental designs, we can identify that in this study, The participants are randomly assigned to receive either the flu vaccine or a placebo, and the participants are not placed in any groups based on characteristics. And so since this study involves participants being randomly assigned and they are not placed into any groups based on characteristics, we can identify. That the design most suitable for this given experiment is completely randomized design, as a completely randomized design involves subjects that are randomly assigned to treatment groups without prior grouping. Therefore, answer choice A is the correct answer, and all other answer choices are incorrect. I hope you found this video to be helpful. Thank you and goodbye.

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Key Concepts

Completely Randomized Design

Randomized Block Design

Matched Pairs Design

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