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front 1 Determine whether the sample described below is a simple random sample. In order to test for a difference in the way that men and women purchase magazines, a research institution polls exactly 762 adult men and 762 adult women randomly selected from adults in the United States. | back 1 The sample is not a simple random sample because every sample of size 1524 does not have the same chance of being selected. |

front 2 What is the difference between a random sample and a simple random sample? | back 2 With a random sample, each individual has the same chance of being selected. With a simple random sample, all samples of the same size have the same chance of being selected. |

front 3 Identify which type of sampling is used: random, systematic, convenience, stratified, or cluster. To determine customer opinion of their service, Business Depot randomly selects 70 stores during a certain week and surveys all customers present in the store. | back 3 Cluster |

front 4 Determine whether the description below corresponds to an observational study or an experiment. In a survey sponsored by a company, 13,072 people were asked what contributes most to their anxiety, and 39% of the respondents said that it was their job. | back 4 The study is an observational study because the survey subjects were not given any treatment. |

front 5 Identify which type of sampling is used: random, systematic, convenience, stratified, or cluster. A magazine asks its readers to call in their opinion regarding the amount of advertising in the present issue. | back 5 Convenience |

front 6 A handler loads one item every 15 minutes, so 160 items are completed in her first week of work. Her manager checks her work by randomly selecting a day of the week, then reviewing all the items she completed that day. Does this sampling plan result in a random sample? Does this sampling plan result in a simple random sample? | back 6 Yes, because each item has an equal chance of being selected. No, because all possible groups of n items do not have an equal chance of being selected. |