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Chapter 1: Q1. (page 9)

Online Medical Info. USA Today posted this question on its website: 鈥淗ow often do you seek medical information online?鈥� Of 1072 Internet users who chose to respond, 38% of them responded with 鈥渇requently.鈥� What term is used to describe this type of survey in which the people surveyed consist of those who decided to respond? What is wrong with this type of sampling method?

Short Answer

Expert verified

These types of surveys are termed voluntary response samples and are biased.

Step by step solution

01

Given information

The sample consists of 1072 internet users who responded at their own will.

Out of these, 38% responded 鈥渇requently鈥� for the website question 鈥淗ow often do you seek medical information online?鈥�

02

Type of sampling for the responses

In this survey, the sample responses were collected from individuals who chose to respond to the survey. The type of sampling is called voluntary response sampling, in which the sample points are self-selected.

Thus, the term that could be used for such survey designs is voluntary sampling.

03

Pitfalls related to the type of sampling

When a study is designed on voluntary sampling responses, the responses are not free of bias.

In this case, the sampled individuals themselves opted for the study and hence cannot be considered as true representatives of the population of all internet users.

A true representative would have responses that would be randomly selected from the population.

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Most popular questions from this chapter

Discrete/ Continuous Data Which of the following describe discrete data?

a. The numbers of people surveyed in each of the next several years for the National Health and Nutrition Examination Surveys.

b. The exact foot lengths (measured in cm) of a random sample of statistics students.

c. The exact times that randomly selected drivers spend texting while driving during the past 7 days.

In Exercises 17鈥�20, refer to the sample of body temperatures (degrees Fahrenheit) in the table below. (The body temperatures are from a data set in Appendix B.)

Conclusion Given the body temperatures in the table, what issue can be addressed by conducting a statistical analysis of the data.

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b. To test for a gender difference in the way that men and women make online purchases, Gallup surveys 500 randomly selected men and 500 randomly selected women.

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Simple Random Sample vs. Random Sample Refer to the definition of simple random sample on page 27 and its accompanying definition of random sample enclosed within parentheses.

Determine whether each of the following is a simple random sample and a random sample.

  1. A statistics class with 36 students is arranged so that there are 6 rows with 6 students in each row, and the rows are numbered from 1 through 6. A die is rolled and a sample consists of all students in the row corresponding to the outcome of the die.

b. For the same class described in part (a), the 36 student names are written on 36 individual index cards. The cards are shuffled and six names are drawn from the top.

c. For the same class described in part (a), the six youngest students are selected.

Back Pain Treatment In a study designed to test the effectiveness of paracetamol (or acetaminophen) as a treatment for lower back pain, 1643 patients were randomly assigned to one of three groups: (1) the 547 subjects in the placebo group were given pills containing no medication; (2) 550 subjects were in a group given pills with paracetamol taken at regular intervals; (3) 546 subjects were in a group given pills with paracetamol to be taken when needed for pain relief. (See 鈥淓ffcacy of Paracetamol for Acute Low-Back Pain,鈥� by Williams, et al., Lancet, doi:10.1016>S0140-6736(14)60805-9.) Is this study an experiment or an observational study? Explain.
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