I am very confused about how to select the appropriate statistical method (parametric or not) by considering N number in the dataset. Some references say that if the N number is below 30, parametric tests cannot be used but some others say that it is not necessary to reach 30 subjects to perform a parametric test as long as the dataset shows a normal distribution.

Can you please provide simple explanations and/or suggest some references that supports both points of view?

Any help will be appreciated.

You may start your reply by giving a short answer as "Yes." or "No." (any other short answers are also welcome) to the question below and then add the details.

Is it necessary to have N>30 to perform parametric tests?