Statistics - 1.3 Simple Random Sampling

What is a​ frame?

A frame lists all the individuals in a population. For example, a list of all registered voters in a particular precinct might be a frame. The frame is a list of the individuals in the population being studied. If the population of interest is all the students at a​ school, the frame would be a list of all the students currently attending that school.

What does it mean when sampling is done without​ replacement?

The population is not changed when a sample is taken from it. When sampling without​ replacement, once an individual is​ selected, the individual is removed from the possible choices for that sample and cannot be chosen again.

Define simple random sampling.

The process of obtaining a simple random sample requires more though than just​ "using chance." A sample of size n from a population of size N is obtained through simple random sampling if every possible sample of size n has an equally likely chance of occurring. The sample is then called a simple random sample.