Suppose we wish to find the required sample size to find a 90% confidence interval for the population proportion with the desired margin of error.If there is no rough estimate 
of the population proportion,what value should be assumed for 
?
Definitions:
Gross Margin Ratio
A financial indicator that calculates the disparity between sales and the cost of goods sold, represented as a portion of sales revenue.
Net Sales
The total revenue from sales reduced by returns, allowances for damaged or missing goods, and discounts.
FOB Destination
A shipping term where the seller pays for transportation of the goods to the buyer's location, and ownership of the goods transfers upon delivery.
Shipping Charges
Shipping charges are fees associated with the transport of goods from one location to another, typically incurred by the seller or buyer in a transaction.
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