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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.
It is quite likely that the sample is not representative of the population and so while statistical conclusion may be valid for the sample, they may not apply to the population.
a biased sample is valid determin
A sample from a population of 1,000 people can consist of any number from 1 to 1,000 individuals, depending on the sampling method and purpose of the study. Typically, researchers choose a sample size that is manageable and representative, often ranging from a few dozen to several hundred individuals. The key is to ensure the sample accurately reflects the characteristics of the overall population to draw valid conclusions.
Because without representative sample, your results will not be valid.