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4 A researcher planning a survey of heads of households in a particular state has...

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4 A researcher planning a survey of heads of households in a particular state has census lists for each of the 23 counties in that state The procedure will be to obtain a random sample of 10 heads of households from each of the 23 counties Which of the following is a true statement about the resulting sample I This is not a proper study because children were not included II This stratified random sample is a type of simple random sample because subjects were randomly selected from each county III This is not a simple random sample because all possible groups of 230 subjects did not have the same probability of being selected IV This study may give important information about the similarities and differences of the 23 counties A III and IV B I and II C I and III None of these gives a complete set D I II and III E

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