As marketing manager for a very large discount building supply, you wish to know what proportion of your city's population conducted do-it-yourself home improvement projects during the past year. The national percentage is 62%; therefore, you decide to

use this value in estimating sample size for a study to achieve 90% confidence with the estimate no more than 5% from the true proportion. If you know that the total city population is 30,000, what is the appropriate sample size?


253

Business

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