Sampling

Question 1

What is simple random sampling?

Answer 1

Every unit in the population has an equal chance of being selected to be part of a sample.

Question 2

What are the steps in simple random sampling?

Answer 2

1. Define the population (N)
   
   2. Choose the sample size (n)
   3. List the population
   4. Assign numbers to potential participants
   5. Find random numbers
      Select sample

Question 3

What are the advantages and disadvantages of simple random sampling?

Answer 3

Advantages

• Cheap
• Easy to conduct
• Sample is highly representative of the population
• Unbiased

Disadvantages
- May be difficult to obtain list of population

Question 4

What is convenience sampling?

Answer 4

Selecting the units that are readily available to be selecte

Question 5

What is systematic sampling?

Answer 5

Sampling follow a particular pattern.

Question 6

What are advantages and disadvantages of systematic sampling?

Answer 6

Advantages

• Representative
• Ensures that sample is evenly spread through the population

Disadvantages

• Worse when there is a pattern
• Reference list may be difficult to obtain.

Question 7

What is cluster sampling?

Answer 7

Sample contains strata that is not necessarily in the same ratio as that in the population, and the strata are pre-divided and based on location (differs from stratified)

Question 8

What are the advantages and disadvantages of cluster sampling?

Answer 8

Advantages

• Efficient as the population is already divided into strata.
• Highly representative of the population (can be better than simple random)

Disadvantages
- Least representative