Chapter 4: Q 1.1. (page 211)
A farmer brings a juice company several crates of oranges each week. A company inspector looks at oranges from the top of each crate before deciding whether to buy all the oranges.
Short Answer
Convenience sampling.
Chapter 4: Q 1.1. (page 211)
A farmer brings a juice company several crates of oranges each week. A company inspector looks at oranges from the top of each crate before deciding whether to buy all the oranges.
Convenience sampling.
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Get started for freeStudent archaeologists An archaeological dig turns up large numbers of pottery shards, broken stone tools, and other artifacts. Students working on the project classify each artifact and assign it a number. The counts in different categories are important for understanding the site, so the project director chooses of the artifacts at random and checks the students’ work. Identify the population and the sample.
Does reducing screen brightness increase battery life in laptop computers? To find out, researchers obtained new laptops of the same brand. They chose of the computers at random and adjusted their screens to the brightest setting. The other laptop screens were left at the default setting—moderate brightness. Researchers then measured how long each machine’s battery lasted.
Was this an observational study or an experiment? Justify your answer.
What kind of error? Which of the following are sources of sampling error and which are sources of non-sampling error? Explain your answers.
(a) The subject lies about past drug use.
(b) A typing error is made in recording the data.
(c) Data are gathered by asking people to mail in a coupon printed in a newspaper.
Sampling frame Refer to the previous exercise. It is more common in telephone surveys to use random digit dialing equipment that selects the last four digits of a telephone number at random after being given the exchange (the first three digits). Explain how this sampling method results undercover which could lead to bias.
An example of a non-sampling error that can reduce the accuracy of a sample survey is
(a) using voluntary response to choose the sample.
(b) using the telephone directory as the sampling frame.
(c) interviewing people at shopping malls to obtain a sample.
(d) variation due to chance in choosing a sample at random.
(e) inability to contact many members of the sample.
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