Single blind study- Double blind study
A single-blind RCT is a randomised trial in which one group of individuals involved in the trial does not know the identity of the intervention that is given to each participant. Usually it is the participants or the investigators assessing the outcomes who do not know the identity of the interventions. Single blind designs are used frequently to evaluate educational or surgical interventions. For instance, investigators could evaluate different educational strategies in patients who would be unaware of the different types of strategies that are being compared. In addition, two surgical procedures could be compared under
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Differentiate between validity and reliability of a research tool.
What are the points that you will keep in mind while deciding the sample size for a study? Give one simple formula you would use for sample size determination.
Given here are the scores of 20 students who took a practical course in nutrition.
For the scores present give the
i) The frequency distribution and cumulative frequency distribution.
ii) Frequency polygon.
Observations
Single blind study- Double blind study
Case – Control study - Intervention study
Observational study- Experimental study