Probability Sampling Techniques - Simple

Question 1

In this case everyone is chosen entirely by chance and each member of the population has an equal chance, or probability, of being selected.

Answer 1

Simple random sampling

Question 2

One way of obtaining a ——— is to give everyone in a population a number, and then use a table of random numbers to decide which individuals to include.

Answer 2

Simple random sampling

Question 3

As with all probability sampling methods, ——— allows the sampling error to be calculated and reduces selection bias.

Answer 3

Simple random sampling

Question 4

A specific advantage is that it is the most straightforward method of probability sampling.

Answer 4

Simple random sampling

Question 5

A disadvantage of ——— is that you may not select enough individuals with your characteristic of interest, especially if that characteristic is uncommon.

Answer 5

Simple random sampling

Question 6

It may also be difficult to define a complete sampling frame and inconvenient to contact them, especially if different forms of contact are required (email, phone, post) and your sample units are scattered over a wide geographical area.

Answer 6

Simple random sampling

Question 7

For example, if you have a sampling frame of 1000 individuals, labelled 0 to 999, use groups of three digits from the random number table to pick your sample. So, if the fürst three numbers from the random number table were 094, select the individual labelled “94”, and so on.

Answer 7

Simple random sampling