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Chapter 1: Q3-6BSC (page 1)

Exercises 5–8 refer to the study of an association between which ear is used for cell phone calls and whether the subject is left-handed or right-handed. The study is reported in “Hemispheric Dominance and Cell Phone Use,” by Seidman et al., JAMA Otolaryngology— Head & Neck Surgery, Vol. 139, No. 5. The study began with a survey e-mailed to 5000 people belonging to an otology online group, and 717 surveys were returned. (Otology relates to the ear and hearing.)

Experiment or Observational Study Is the study an experiment or an observational study? Explain

Short Answer

Expert verified

The study is referred to as an observational study.

Step by step solution

01

Given information

The study aims to determine the association between the ear used while taking calls and the left or rightness of subjects.

The responses are collected through a survey on e-mail to 5000 online group members, getting 717 responses.

02

Step 2:Mode of acquiring responses

The key difference between an experiment and an observational study is the application of treatments. Experiments use certain treatments for gathering responses, while observational study gathers the same through simple observation.

03

Step 3:Making a decision in the context of the study

The study is an observational study as it does not use any factors or treatments for gathering responses. It simply sends e-mails to the group members and records the responses.

Thus, the study is an observational study.

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Most popular questions from this chapter

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

Subject


12345
8 AM9798.597.697.798.7
12 AM97.697.89898.498.4

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?

In Exercises 29–36, answer the given questions, which are related to percentages.

Percentages in Negotiations When the author was negotiating a contract for the faculty and administration at a college, a dean presented the argument that if faculty receive a 4% raise and administrators receive a 4% raise, that’s an 8% raise and it would never be approved. What’s wrong with that argument?

In Exercises 21–24, refer to the data in the table below. The entries are white blood cell counts (1000 cells,ML) and red blood cell counts (million cells,ML) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.

Subject


12345
White8.75.97.36.25.9
Red4.915.594.444.85.17

Source of the Data Considering the source of the data, does that source appear to be biased in some way?

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.

b. Why would better results be obtained by observing hand washing instead of asking about it?

What’s Wrong with This Picture? The Newport Chronicle ran a survey by asking readers to call in their response to this question: “Do you support the development of atomic weapons that could kill millions of innocent people?” It was reported that 20 readers responded and that 87% said “no,” while 13% said “yes.” Identify four major flaws in this survey.
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