5.4.1: Exercises

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Leah Griffith, Veronica Holbrook, Johnny Johnson & Nancy Garcia
Rio Hondo College

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In a study, the sample is chosen by separating all cars by size, and selecting 10 of each size grouping. What is the sampling method?
In a study, the sample is chosen by writing everyone’s name on a playing card, shuffling the deck, then choosing the top 20 cards. What is the sampling method?
A city government needs to know if its residents will support the construction of a new hospital. Which procedure would be the most appropriate for creating a sample of the city's population?
1. Survey a random sample of doctors who live in the city.
2. Survey a random sample of persons within each neighborhood of the city.
3. Survey a random sample of people who live within a 5-mile radius of the proposed hospital site.
4. Survey every 100th person who visits one of the other hospitals in the city.
The math department wants to know students' opinions of how much math homework they should be doing. Which procedures would be the most appropriate for getting an unbiased sample?
1. Survey a selection of students enrolled at the college.
2. Survey enrolled students chosen from the first 1000 students listed alphabetically.
3. Survey a selection of students enrolled in a math course.
4. Survey a selection of students walking through the Science Building.
A city government wants to conduct a survey among the city's homeless to discover their opinion about the recent ban on camping in certain public areas.
1. They decide to do a random survey of people residing in homeless shelters. Does this seem like a good sample? Why or why not?
2. They decide to survey all the homeless people contacted by the police. Does this seem like a good sample? Why or why not?
3. They leave signs at several homeless encampments asking people to text their answers to some questions. Does this seem like a good sample? Why or why not?
4. Design a better sampling process than any of those already given.
A local supermarket is considering the addition of a coffee bar to its premises. They want to find out how much people might patronize the coffee bar. Design a survey for the supermarket to use.