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.

simple random sample

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. ***In Other Words Simple random sampling is like selecting names from a hat.

What is a sample without replacement?

In a sample without replacement, an individual who is selected is removed from the population and cannot be chosen again

Are random number really random?

Random-number generators are not truly random, because they are programs, and programs do not act "randomly." The seed dictates the random numbers that are generated

What is a sample with replacement?

a sample with replacement, a selected individual is placed back into the population and could be chosen a second time. We use sampling without replacement so that we don't select the same client twice.

Random sampling

is the process of using chance to select individuals from a population to be included in the sample

What is the seed when using random number generator?

The seed is an initial point for the generator to start creating random numbers—like selecting the initial point in the table of random numbers. The seed can be any nonzero number