I would like to know whether there is any reference stating sample size is not required for quality of life assessment (Non- clinical trial).
In short, a sample size calculation is required. If you want to assess the quality of life (QoL) of a specific group of people (elderly residents of a city, people with a specific disease), unless you are surveying everyone, you need to consider sample size and sample design, as well as what is known re the variance/sensitivity/norms for the quality of life measure you are using. Similarly, if want to compare quality of life of a group of people to population norms or track quality of life over time, you always ought to start with a sample size calculation. The only time you might not do a sample size calculation is if you are testing QoL of a 100% sample, but even there, I'd look at the research questions and I'd want to know my statistical power to answer it.
As far as I know, sampling procedures and sample size calculation are required in every research.
sample size is required for a study with which results could be validated
As mentioned by others, you will have to do power analysis to derive sample size calculations, so you can get meaningful data with statistical signficance
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