Answered: d. A researcher polls people as they…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 4E

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P3 Answer d e f g Answers only

Transcribed Image Text:ce LET'S DO IT! 1. Review the concepts related to types of sampling techniques. 2. Read carefully each statement below. 3. Classify each sample and determine the type of sampling technique. Write your ANSWER in your answer sheets. a. A test of the effectiveness of a new curriculum could begin by dividing an area by school district, then choosing a school or set number of schools at random and sampling students from each. b. At a birthday party, teams for a game are chosen by putting everyone's name into a jar, and then choosing the names at random for each team. _c. A market survey by a company interested in branching into a new market might choose a population of people using similar products, stratify it by brand, and sampling from each stratum. d. A researcher polls people as they walk by on the street. e. A survey assessing customer satisfaction with a product might establish clusters based on place of purchase, then choose a number of those clusters at random. f. A survey about timekeeping might divide the population by time zone, then take 100 random samples per zone. g. Suppose our desired sample size is n=300, and we wish to ensure that the distribution of subjects' ages in the sample is similar to that in the population. We know from census data that approximately 30% of the population are under age 20; 40% are between 20 and 49; and 30% are 50 years of age and older. We would then sample n=90 persons under age 20, n=120 between the ages of 20 and 49 and n=90 who are 50 years of age and older.

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