Please explain all. I'll rate positive.

Which of the following is a correct statement? 0 Random selection ensures that we get precise and accurate estimates. 0 A large sample size always ensures that our sample is representative of the population. 0 If all other things are equal, we need a larger sample size for a larger population than when sampling from a small population in order to achieve the same precision. Q We do not need to randomize if our sample size is large enough. 0 In a properly chosen sample, an estimate will be less variable with a large sample size in comparison to a small sample size