Srs or Stratified Sample

Sampling method that in which the population is divided into HOMOGENEOUS groups and SRS’s are pulled from each group.

• Stratified Sampling

• Simple Random Sampling (SRS)

• Cluster Sampling

• Systematic Sampling

An SRS of 25 students is taken from each grade to form the sample.  This is what type of sampling design?

• Cluster

• SRS

• Stratified

• Multistage

Which sampling method reduces variability?

• SRS

• Stratified

• Cluster

• Systematic

Determine which one is an example of Simple Random Sample (SRS), Stratified Sample(STR), or Cluster Sample (CLS) for the following statement: There are 250 seventh graders and 300 eighth graders at Generic Middle School. We ask 45 seventh graders and 50 eighth graders how many siblings are in their family.

• SRS

• STR

• CLS

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

The president of a college randomly selects 2 students from each department to serve on a student advisory board.

• Convenience

• Systematic

• Stratified

• Simple 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 is used when it is important to have members from each segment of the population. Depending on the study, members are divided up into 2 or more different subsets, called strata, that share a similar characteristic, such as age, gender, ethnicity, or even political preference. A sample is then randomly selected from each strata.

The teacher samples her class by randomly selecting 5 girls and then randomly selecting 7 boys.  This type of sampling is called?

• Stratified

• Systematic

• SRS

• Cluster

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