1) Randomized comparative design

2) Matched- Pair Design

3) Block Design.

In a hypothetical situation, you are a member of a research team and have already come up, you believe, is the single dose vaccine for Covid-19: much more effective than J&J, Moderna, and Pfizer vaccines, with even a higher efficacy. Now comes the testing phase! Choose ONE of the designs above and explain how you would conduct the study. Please elaborate on your explanatory variables, response variables, factors, control and treatment group, your sampling method( simple random, stratified , cluster etc). Also, identify any confounding variables and how your study will account for this.