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Unformatted text preview: it very hard to give up their television. (c) Can you conclude that a higher proportion would nd it dicult to give up their computer than their television? Why or why not? 3. A states environmental agency worries that a large percentage of cars may be violating clean air emissions standards. The agency hopes to check a sample of vehicles in order to estimate the proportion violating the standards with a margin of error of 0.03 with 90% condence. A pilot study suggested that this proportion was 0.15. How many cars should be sampled for a full investigation? 1...
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 Fall '10
 Jager,AbigailL
 Standard Deviation

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