The U.S. Customs Service conducted a random check of Miami longshoremen and found that 36 of 50 had arrest records. (a) Construct a 90 percent confidence interval for the true proportion. (b) Is the sample size large enough to be convincing? Explain. (c) How would you select a random sample of longshoremen? (See U.S. News&World Report 123, no. 22 [December 8, 1997].)
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