A large sample will reduce the effects of random variations.
One advantage of inferential statistics is that large predictions can be made from small data sets. However, if the sample is not representative of the population then the predictions will be incorrect.
In statistics it is a random sample
The sample mean may differ from the population mean, especially for small samples.
It depends on how large or small your sample is.
A large matrix with small pixel will give a better resolution.
that you have a large variance in the population and/or your sample size is too small
A sample consists of a small portion of data when a population is taken from a large amount.
A small sample size and a large sample variance.