Sampling Methods Overview

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Questions and Answers

How does the presider distribute the speaker evaluation surveys?

  • To the first 40 members who arrive.
  • To every fifth person who arrives, starting with the third. (correct)
  • To every person who arrives at the auditorium.
  • To every third person who arrives.

What method does Shawn use to measure his Internet connection speed?

  • He divides the day into four parts and measures at 5 random times per part. (correct)
  • He divides the day into three parts and measures once in each.
  • He measures it continuously for an entire day.
  • He measures at random times throughout the entire day.

What is the size of the sample chosen by 24 Hour Fitness for the satisfaction survey?

  • All club members
  • 20 members
  • 100 members
  • 40 members (correct)

Which part of the day is NOT included in Shawn's measurement of Internet speed?

<p>Afternoon (A)</p> Signup and view all the answers

What type of survey does 24 Hour Fitness administer to its members?

<p>A satisfaction survey (C)</p> Signup and view all the answers

Is a simple random sample always preferred over other sampling plans?

<p>Yes, it provides the same information but with a smaller sample size. (D)</p> Signup and view all the answers

When conducting a cluster sample, is it better to have fewer clusters with more individuals if the clusters are heterogeneous?

<p>Yes, it helps to reduce variability within clusters. (D)</p> Signup and view all the answers

Are inferences based on voluntary response samples generally reliable?

<p>No, they cannot be generalized to a larger population. (B), No, they often suffer from bias. (C)</p> Signup and view all the answers

When obtaining a stratified sample, must the number of individuals included within each stratum be equal?

<p>No, the sizes can vary based on stratum characteristics. (B)</p> Signup and view all the answers

What type of sampling is demonstrated when a quality-control manager selects every 8th chip starting with the 3rd one?

<p>Systematic sampling (D)</p> Signup and view all the answers

What type of sampling is used when the State Athletic Commission tests all members of the selected high school baseball teams?

<p>Cluster sampling (A)</p> Signup and view all the answers

What type of sampling is demonstrated when a farmer samples all the trees within randomly selected subsections of his orchard?

<p>Cluster sampling (B)</p> Signup and view all the answers

What type of sampling is involved when a college official takes a simple random sample from each class of students?

<p>Stratified sampling (D)</p> Signup and view all the answers

Flashcards

Simple Random Sampling

A method of selecting a sample from a population where every member of the population has an equal chance of being chosen.

Systematic Sampling

A method of selecting a sample from a population where every nth member is chosen, starting from a random point.

Stratified Sampling

A method of selecting a sample from a population where the population is divided into groups (strata), and random samples are selected from each stratum.

Cluster Sampling

A method of selecting a sample from a population where the population is divided into clusters (groups), and random samples of clusters are selected.

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Convenience Sampling

A method of selecting a sample from a population where the researcher selects participants based on their accessibility.

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Voluntary Response Sampling

A sampling method where individuals are selected based on their own willingness to participate.

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Reliability of Voluntary Response Samples

Inferences based on voluntary response samples are unreliable because they often represent only a specific group with strong opinions.

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Cluster Sampling with Heterogeneous Populations

Having fewer clusters with more individuals in each cluster is better for heterogeneous populations in cluster sampling.

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Study Notes

Sampling Methods

  • Simple Random Sampling: Every member of the population has an equal chance of being selected. A smaller sample size is needed compared to other methods to obtain the same amount of information.
  • Cluster Sampling: The population is divided into clusters (groups). A random selection of clusters is made, and all members within those selected clusters are included in the sample. Fewer clusters with more individuals is better when clusters are heterogeneous.
  • Stratified Sampling: Dividing the population into strata (groups with similar characteristics). A simple random sample is taken from each stratum. The number of individuals in each stratum does not need to be equal.
  • Systematic Sampling: Selecting every nth member of the population, starting from a randomly selected point.
  • Convenience Sampling: Choosing individuals who are easily accessible. Inferences are not reliable.
  • Voluntary Response Sampling: Individuals self-select to participate in the sample. Inferences are not reliable.

Identifying Sampling Types

  • Question 5:
    • Blank 1: Systematic Sampling
    • Blank 2: Cluster Sampling
    • Blank 3: Simple Random Sampling
    • Blank 4: Stratified Sampling
    • Blank 5: Simple Random Sampling
    • Blank 6: Voluntary Response Sampling
    • Blank 7: Cluster Sampling
    • Blank 8: Stratified Sampling
    • Blank 9: Convenience Sampling
    • Blank 10: Systematic Sampling
    • Blank 11: Stratified Sampling
    • Blank 12: Simple Random Sampling

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