A simple random sample of size 23 is defined to be A sample of size 23 chosen in such a way that every individual Item in the population has the same chance of being selected A sample of size 23 chosen in such a way that every item in the population has a nonzero chance of being selected. A sample of size 23 chosen in such a way that every item in the population has the same chance of being selected. A sample of size 23 chosen in such a way that every possible set of 23 items in the population has an equal chance to be the sample actually selected, All of these are correct. They are essentially equivalent definitions