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PSY-223 1-2 Exercise: Simple Random Sample Kayleigh Cochran

2. Simple Random Sample

What is a random sample?

A random sample is when every element of the population has the same chance of being chosen to be part of a sample. One way to pick a random sample is when you are listening to the radio and you text the radio to win what they are offering, well you are essentially you are putting your name in a pot to be selected. Then a computer randomly selects a number as a winner. However, when everyone sends their text in the amount of time allowed their names should only be in there once, which giving everyone an equal chance of getting their number selected.

When the Bureau of Labor Statistics conducts a survey, it begins by partitioning the United States adult population into 2,007 groups called primary sample units. Assume that these primary sampling units all contain the same number of adults. If you randomly select one adult from each primary sampling unit, is the result of a simple random sample? Why or why not?

When you break up the population into primary sample units or subgroups, then pick a sample from each group; this is not a simple random sample; this is called stratified sampling. For a simple random sample, you would not break up the population into subgroups. If you want a simple random sample, you will choose from the population and a whole.

Refer to the primary sampling units described in part b and describe a sampling plan that results in a simple random sample.

When you create a simple random sample, if the population has subgroups, then you would randomly select one group, then you would conduct a simple random sampling....