Stratified Sample vs Random Sample

Identify the sampling design: The LFCC registrar wants to investigate attitudes of their graduates.  The registrar randomly selects 100 names from each of the four past graduating classes.

• cluster

• volunteer

• stratified

• simple random

Identify the sampling design: Student government randomly samples 25 students of each of the four classes.

• stratified

• volunteer

• systematic

• simple random

Farmer Joe separates his farm into 10 regions.  He then randomly selected 5 trees from each region to estimate the number of apples produced on his apple tree farm.  This is _____________ sampling.  

• Cluster

• Systematic

• Stratified

• Simple

Which of the following best describes the difference between simple random sampling and stratified sampling?

• Simple random sampling divides the population into strata, while stratified sampling does not.

• Stratified sampling can only be used when the population size is known.

• Simple random sampling gives every individual an equal chance of being selected, whereas stratified sampling ensures representation from different subgroups.

• Stratified sampling is less time-consuming and more cost-effective than simple random sampling.

Which of the following surveying methods divides individuals by a shared attribute, then randomly surveys members within each attribute-group?

• Simple random

• Stratified random

• Cluster random

• Strategic Random

A mid-size paper company wishes to take a random sample of its clients. Clients are divided into Small (under $50k), Medium ($50k to $250k), and Large (over $250k). A random digits table is used to select 30 small, 15 medium, and 10 large clients.​

• Convenience Sample

• Voluntary response Sample

• SRS

• Cluster Sample

• Stratified Sample

• Systematic Sample

A sample in which members of the population are divided into two or more subsets called strata that share a common characteristic. The participants are then randomly selected from each group.

• Systematic Random Sample

• Stratified Random Sample

• Cluster Sample

• Simple Random Sample

A mid-size paper company wishes to take a random sample of its clients. Clients are divided into Small (under $50k), Medium ($50k to $250k), and Large (over $250k). A random digits table is used to select 30 small, 15 medium, and 10 large clients.​ (a)  

• Convenience Sample

• Voluntary response Sample

• SRS

• Cluster Sample

• Stratified Sample

• Systematic Sample

when a population is divided into groups with similar characteristics and a sample is randomly chosen from each group

• stratefied sampling

• cluster sampling

• systematic sampling

• convenience sampling

A teacher conducting research on a statistical intervention decided to divide her students into age groups and then select students from each group.

• Simple Random Sampling

• Systematic Random Sampling

• Stratified Random Sampling

• Cluster or Area Sampling