What is the formula of stratified random sampling?

What is the formula of stratified random sampling?

For example, if the researcher wanted a sample of 50,000 graduates using age range, the proportionate stratified random sample will be obtained using this formula: (sample size/population size) x stratum size.

How do you do simple random sampling?

How to perform simple random sampling

1. Step 1: Define the population. Start by deciding on the population that you want to study.
2. Step 2: Decide on the sample size. Next, you need to decide how large your sample size will be.
3. Step 3: Randomly select your sample.
4. Step 4: Collect data from your sample.

What are the advantages of stratified random sampling?

Stratified sampling offers several advantages over simple random sampling.

• A stratified sample can provide greater precision than a simple random sample of the same size.
• Because it provides greater precision, a stratified sample often requires a smaller sample, which saves money.

When should you use stratified sampling?

When to use stratified sampling That means every member of the population can be clearly classified into exactly one subgroup. Stratified sampling is the best choice among the probability sampling methods when you believe that subgroups will have different mean values for the variable(s) you’re studying.

What is the advantage and disadvantage of cluster sampling?

Since cluster sampling selects only certain groups from the entire population, the method requires fewer resources for the sampling process. Therefore, it is generally cheaper relative to simple random or stratified sampling as it requires fewer administrative and travel expenses.

What is the importance of cluster sampling?

Cluster sampling offers the following advantages: Cluster sampling is less expensive and more quick. It is more economical to observe clusters of units in a population than randomly selected units scattered over throughout the state. Cluster Sample permits each accumulation of large samples.

Why would you use cluster sampling?

Use. Cluster sampling is typically used in market research. It’s used when a researcher can’t get information about the population as a whole, but they can get information about the clusters. Cluster sampling is often more economical or more practical than stratified sampling or simple random sampling.

What are the three major differences between cluster sampling and stratified sampling?

Stratified sampling is one, in which the population is divided into homogeneous segments, and then the sample is randomly taken from the segments. Cluster sampling refers to a sampling method wherein the members of the population are selected at random, from naturally occurring groups called ‘cluster’.

What is difference between cluster and stratified sampling?

The main difference between cluster sampling and stratified sampling is that in cluster sampling the cluster is treated as the sampling unit so sampling is done on a population of clusters (at least in the first stage). In stratified sampling, the sampling is done on elements within each stratum.

What is cluster sampling method?

Cluster sampling is a probability sampling method in which you divide a population into clusters, such as districts or schools, and then randomly select some of these clusters as your sample. The clusters should ideally each be mini-representations of the population as a whole.

Which one of the following is a Nonprobability sample method?

In non-probability sampling, the sample is selected based on non-random criteria, and not every member of the population has a chance of being included. Common non-probability sampling methods include convenience sampling, voluntary response sampling, purposive sampling, snowball sampling, and quota sampling.