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# Algebra 2: Types of Surveys and Samples

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@ProlificRetinalite5738

### What is an Observational Study?

Researchers don't assign choices; they just simply observe them.

### What defines an Experimental Study?

Researchers randomly assign subjects to different factors and compare the results of the study.

### What is a Sample Survey?

Data is to be collected only from some members of the population.

### What is a Census Survey?

<p>Data is to be collected from each member of the population.</p> Signup and view all the answers

### What is a Voluntary Response Sample?

<p>A large group of people is invited to respond, and all who respond are counted.</p> Signup and view all the answers

### What characterizes a Convenience Sample?

<p>Only includes individuals who are convenient to the sample.</p> Signup and view all the answers

### What are Systematic Random Samples?

<p>When statisticians try to incorporate as much randomness as they can into their samples.</p> Signup and view all the answers

### What is a Simple Random Sample?

<p>When every person in the population has an equal chance at being selected.</p> Signup and view all the answers

### What are Cluster Samples?

<p>Statisticians might divide the population into smaller representative clusters of the population and randomly choose clusters.</p> Signup and view all the answers

### What are Stratified Samples?

<p>Statisticians might divide the population into groups that are each alike for a particular characteristic, then randomly sample from each group.</p> Signup and view all the answers

### What are Judgment Samples?

<p>When a sample is unscientific and judged based on what someone thinks is 'typical'.</p> Signup and view all the answers

## Study Notes

### Types of Studies

• Observational Study: Researchers observe subjects without assigning choices or conditions, focusing purely on the natural behaviors or characteristics.
• Experimental Study: Researchers assign subjects randomly to different conditions or factors to compare outcomes, allowing for controlled experimentation.

### Types of Surveys

• Sample Survey: Involves collecting data from a subset of the population rather than the entire group, allowing for manageable data collection.
• Census Survey: Requires data collection from every member of the population, providing a complete overview of all subjects.

### Types of Sampling Methods

• Voluntary Response Sample: Involves inviting a large group to respond; all willing participants are included, which may lead to bias due to self-selection.
• Convenience Sample: Comprises individuals who are easily accessible or convenient to the researcher, potentially compromising representativeness.

### Random Sampling Techniques

• Systematic Random Samples: Aims to introduce randomness into the selection process, often using a fixed interval or pattern to choose participants.
• Simple Random Sample: Ensures every individual in the population has an equal chance of being selected, promoting fairness and unbiased representation.

### Cluster and Stratified Sampling

• Cluster Samples: Involves dividing the population into smaller, representative clusters and randomly selecting entire clusters for the study.
• Stratified Samples: Involves dividing the population into distinct groups based on shared characteristics and randomly sampling from each group to ensure representation across key segments.

### Judgmental Sampling

• Judgment Samples: An unscientific method where a sample is deemed "typical" based on the researcher's subjective judgment, lacking formal selection processes.

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## Description

Test your understanding of various types of surveys and sampling methods in this algebra 2 quiz. Learn the differences between observational studies, experimental studies, and sample surveys through flashcards that define each concept.

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