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Chapter 1: Problem 9

Inferences based on voluntary response samples are generally not reliable.

Short Answer

Expert verified
Voluntary response samples are unreliable due to self-selection and potential bias, unlike random samples which better represent the population.

Step by step solution

01

Understand Voluntary Response Samples

A voluntary response sample consists of individuals who choose to participate in a survey or study on their own. These participants are not randomly selected, which means they have opted in by their own decision.
02

Identify Potential Bias

In a voluntary response sample, there is a high likelihood of bias as people with strong opinions (usually either very positive or very negative) are more likely to participate. This skews the results because not every potential respondent is represented.
03

Compare with Random Sampling

Random sampling is a technique where every individual in the population has an equal chance of being selected. This method reduces bias and provides a more accurate representation of the overall population.
04

Explain the Reliability Issue

Voluntary response samples cannot reliably represent the entire population because the participants are self-selected. This leads to over- or under-representation of certain groups, making the inferences drawn from such samples generally unreliable.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

sampling bias
Sampling bias occurs when certain members of a population are systematically more likely to be selected in a sample than others.
This can happen if the selection process is flawed or if certain groups are overrepresented or underrepresented.
Voluntary response samples often introduce sampling bias because they rely on individuals to choose to participate.

In such samples, people with strong opinions are more likely to respond, leading to skewed results.
This makes it difficult to get a true picture of the larger population.
Therefore, conclusions drawn from a biased sample can be misleading or incorrect.
random sampling
Random sampling is the process of selecting a subset of individuals from a population where every member has an equal chance of being chosen.
This method helps in reducing bias and ensures that the sample is representative of the population.

Here's why random sampling is beneficial:
  • Reduces Bias: By giving each individual an equal chance of selection, it minimizes the risk of over- or under-representing any group.
  • Enhances Representativeness: A randomly selected sample reflects the population more accurately.
  • Improves Reliability: Conclusions drawn from such samples are generally more trustworthy.
With random sampling, inferences made about the population are more likely to be correct and reliable.
survey reliability
Survey reliability is crucial for obtaining accurate and trustworthy results. A reliable survey consistently reflects the true opinions or behaviors of the overall population.

Several factors affect survey reliability:
  • Sampling Method: Using random sampling methods helps improve reliability by reducing bias.
  • Sample Size: Larger samples tend to provide more reliable results as they better represent the population.
  • Question Design: Clear and unbiased questions can help get accurate answers.
  • Response Rate: High response rates ensure that the sample mirrors the population's diversity.
Voluntary response samples can compromise survey reliability since they may not represent the entire population accurately, especially if certain groups opt out of participating.
Ensuring that the survey method is sound, and free from bias, will improve the reliability of the conclusions drawn.

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Most popular questions from this chapter

Define simple random sampling.

Define the following (a) Experimental unit (b) Treatment (c) Response variable (d) Factor (e) Placebo (f) Confounding

What is a cross-sectional study? What is a case-control study? Which is the superior observational study? Why?

In Problems 11-22, identify the type of sampling used. A survey regarding download time on a certain website is administered on the Internet by a market research firm to anyone who would like to take it.

Magnum, LLC, is a web page design firm that has two designs for an online hardware store. To determine which is the more effective design, Magnum uses one page in the Denver area and a second page in the Miami area. For each visit, Magnum records the amount of time visiting the site and the amount spent by the visitor. (a) What is the explanatory variable in this study? Is it qualitative or quantitative? (b) What are the two response variables? For each response variable, state whether it is qualitative or quantitative. (c) Explain how confounding might be an issue with this study.
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