There is no passage to go from. It is difficult to make a conclusion without the passage being present.
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A valid conclusion is when your conclusion is written using the text you have and get it right.
Scientists use the data from an experiment to evaluate the hypothesis and draw a valid conclusion.
A valid deductive argument will have a valid premise and conclusion and a fallacy may be true, it all matters on how you came to the conclusion.
A valid conclusion would be that a tautology is true.
Providing of course that a sample is representative of the population from which it is drawn, the bigger it is the more likely it will be to lead to a valid conclusion. Therefore, the best sample size when there are no restrictions, as in this case, would be one of 1000.