A marketing class is engaged in a project to estimate the proportion of homes receiving both HBO and ShowTime cable service. The class plans to use a confidence coefficient of 0.95 and a maximum error of the estimate equal to 0.10 . If 2500 homes in this city receive cable service, determine the sample size for the class to use.
Question 2
In an effort to determine the average loaded weight of trucks leaving a gypsum wallboard plant, a random sample is to be taken from the 600 trucks scheduled for this month. From past studies, the population standard deviation is known to be 2500 lbs. A 95-percent confidence interval is to be used and the average, , is to be estimated within 500 pounds. Determine the sample size needed.
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