Table of contents

1. Intro to Stats and Collecting Data1h 14m
2. Describing Data with Tables and Graphs1h 55m
3. Describing Data Numerically2h 5m
4. Probability2h 16m
5. Binomial Distribution & Discrete Random Variables3h 6m
6. Normal Distribution and Continuous Random Variables2h 11m
7. Sampling Distributions & Confidence Intervals: Mean3h 23m
8. Sampling Distributions & Confidence Intervals: Proportion1h 12m
- Sampling Distribution of Sample Proportion
  29m
- Confidence Intervals for Population Proportion
  42m
9. Hypothesis Testing for One Sample3h 29m
10. Hypothesis Testing for Two Samples4h 50m
11. Correlation1h 6m
12. Regression1h 50m
13. Chi-Square Tests & Goodness of Fit1h 57m
14. ANOVA1h 57m

1. Intro to Stats and Collecting Data

Intro to Stats

Statistics

1. Intro to Stats and Collecting Data

Intro to Stats

Previous problemNext problem

2:24 minutes

Problem 1.1.1

Textbook Question

Computer Virus In an AOL survey of Internet users, this question was posted online: “Have you ever been hit by a computer virus?” Among the 170,063 responses, 63% answered “yes.” What term is used to describe this type of survey in which the people surveyed consist of those who chose to respond? What is wrong with this type of sampling method?

Verified step by step guidance

Identify the type of survey: This survey is an example of a 'voluntary response sample' because it consists of individuals who chose to respond to the survey question.

Understand the nature of voluntary response samples: In voluntary response samples, participants self-select to be part of the survey, which can lead to biased results.

Explain the potential bias: The main issue with voluntary response samples is that they often attract individuals with strong opinions or experiences related to the survey topic, which may not represent the general population.

Discuss the impact of bias: Due to the self-selection bias, the results of the survey may not be generalizable to the entire population of Internet users, as those who have experienced a computer virus might be more inclined to respond.

Consider alternative sampling methods: To obtain more representative results, a random sampling method could be used, where every individual in the population has an equal chance of being selected for the survey.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Video duration:

Play a video:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Voluntary Response Sample

A voluntary response sample is a type of non-probability sampling method where participants self-select to be part of the survey. This often leads to biased results because individuals with strong opinions or interests in the topic are more likely to respond, which may not represent the broader population accurately.

Sampling Bias

Sampling bias occurs when the sample collected is not representative of the population intended to be analyzed. In the context of voluntary response samples, the bias arises because the sample is skewed towards individuals who are more motivated to respond, often leading to overrepresentation of certain viewpoints and underrepresentation of others.

Non-Probability Sampling

Non-probability sampling refers to sampling techniques where not all members of the population have a chance of being selected. This contrasts with probability sampling, where every member has a known, non-zero chance of being chosen. Non-probability methods, like voluntary response sampling, can lead to biased results and limit the generalizability of the findings.

Watch next

Master Introduction to Statistics Channel with a bite sized video explanation from Patrick

Start learning

Related Videos

Related Practice

Multiple Choice

A survey of 40 gym members from a large gym finds an average work out duration is 52 minutes. Is this a parameter or a statistic?

Multiple Choice

Which of the following is NOT quantitative data?

Multiple Choice

Which of the following is a discrete quantitative set of data?

Textbook Question

Body Temperatures Listed below are body temperatures from six different subjects measured at two different times in a day (from Data Set 5 “Body Temperatures” in Appendix B).

a. Are the two sets of data independent or dependent? Explain.

[Image]

Textbook Question

Reported Versus Measured In a survey of 1046 adults conducted by Bradley Corporation, subjects were asked how often they wash their hands when using a public restroom, and 70% of the respondents said “always.”

a) Identify the sample and the population.

Textbook Question

In Exercises 5–8, determine whether the given source has the potential to create a bias in a statistical study.

AAA The American Automobile Association (AAA) is a not-for-profit federation of motor clubs that provides automotive and travel services. AAA conducts a survey of its members about their use of public transportation versus private automobiles.

Textbook Question

In Exercises 13–20, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.

Bias in Jury Selection In the case of Casteneda v. Partida, it was found that during a period of 11 years in Hidalgo County, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry. Among the people eligible for grand jury duty, 79.1% were Americans of Mexican ancestry.

Textbook Question

In Exercises 21–24, refer to the sample of body temperatures (degrees Fahrenheit) in the table below. (The body temperatures are from Data Set 5 in Appendix B.)

[IMAGE]

Context of the Data Refer to the table of body temperatures. Is there some meaningful way in which each body temperature recorded at 8 AM is matched with the 12 AM temperature?

Show more practices

Download the Mobile app

Do not sell my personal information

Accessibility

Patent notice

Sitemap