Chapter 1: Q.1.5. (page 10)
The data are the number of machines in a gym. You sample five gyms. One gym has machines, one gym has machines, one gym has ten machines, one gym has machines, and the other gym has machines. What type of data is this?
The numbers of machines are the quantitative discrete data.
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Suppose you want to determine the mean number of cans of soda drunk each month by students in their twenties at your school. Describe a possible sampling method in three to five complete sentences. Make the description detailed.
With your classmates, brainstorm some ways you could overcome these problems if you needed to conduct a phone or mail survey.
For the following four exercises, determine the type of sampling used (simple random, stratified, systematic, cluster, or convenience).
A computer generates 100 random numbers, and 100 people whose names correspond with the numbers on the list are chosen.
Suppose you want to determine the mean number of students per statistics class in your state. Describe a possible sampling method in three to five complete sentences. Make the description detailed.
A scholarly article about response rates begins with the following quote:
“Declining contact and cooperation rates in random digit dial (RDD) national telephone surveys raise serious concerns about the validity of estimates drawn from such research.”The Pew Research Center for People and the Press admits: “The percentage of people we interview – out of all we try to interview – has been declining over the past decade or more.”
a. What are some reasons for the decline in response rate over the past decade?
b. Explain why researchers are concerned with the impact of the declining response rate on public opinion polls.
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