Interpreting Samples

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Mathematics

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1. VOCABULARY Copy and complete: A sample for which each member of a population has an equal chance of being selected is a(n) ? sample. 2. * WRITING Describe the difference between an unbiased sample and a biased sample. CLASSIFYING SAMPLES Identify the type of sample described. Then tell if the sample is biased. Explain your reasoning. 3. A taxicab company wants to know if its customers are satisfied with the service. Each driver surveys every tenth customer during the day. 4. A town council wants to know if residents support having an off-leash area for dogs in the town park. Eighty dog owners are surveyed at the park. 5. An English teacher needs to pick 5 students to present book reports to the class. The teacher writes the names of all students in the class on pieces of paper, puts the pieces in a hat, and chooses 5 names without looking. FINDING MARGIN OF ERROR Find the margin of error for a survey that has the given sample size. Round your answer to the nearest tenth of a percent. 6. 260 7. 1000 8.750 9. 6400
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