A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 99​% confident that the sample proportion will not differ from the true proportion by more than 5​%? A previous study indicates that the proportion of households with two cars is 22​%.     A. 584   B. 373   C. 7   D. 456

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Q: (a) What proportion of the population has scores below 27 on the Chapin test? D.15866 (b) What…

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Q: A random sample of medical files is used to estimate the proportion p of all people who have blood…

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Q: 4. In statistics, the formula E = t can be used to calculate a margin of error. Solve this formula…

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