CHAP 19 Questions

CHAP 19 Questions - internet. 4. (Hypothetical) A...

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Chapter 19 1. Give at least two types of bias (with examples) that one encounters when trying to conduct a phone survey by looking up numbers randomly in a phone book. 2. A polling group wants to obtain a representative sample of students at a university to find out what students think of tuition rates. They position interviewers at the entrances to the student union on Monday afternoon, the largest dormitory on Tuesday morning, and the football stadium on one game night. At each location, the interviewers take 300 interviews. a) Find at least two problems with this sampling procedure and justify why they are problems. b) Suppose instead that they mailed 900 questionnaires to people randomly selected by drawing from a pool of student ID numbers. Would this be a good sample? Why or why not? 3. Give at least two examples of potential bias when conducting an online survey via the
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Unformatted text preview: internet. 4. (Hypothetical) A researcher wants to survey 1,000 people at her university in order to find out whether they prefer coffee or tea. She takes a simple random sample based on student and employee ID numbers and calls each person in her sample. Is she likely to get unbiased results if she asks the person Isnt coffee better than tea? Why or why not? 5. (Hypothetical) A toothpaste manufacturer wants to show that more people buy its product than any other toothpaste brand. To prove this, they hire a polling organization to take a simple random sample of 1,000 families. Each person in the family above age 5 is asked if they use the manufacturers toothpaste. What is wrong with this sample?...
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