Sample Size Determination to Estimate the Number of Units Shipped by a Foundry

The foundry industry involves pouring liquid metal or metal alloy into molds to create parts of specific shapes and measurements. The Tecumseh foundry is a notable player in this field, producing roughly 42,000 tons of metal each year. However, like many foundries in Brazil, Tecumseh faces challenges in accurately converting its productive volume into the number of pieces produced. Without a reliable and effective system for this conversion, the only option is manual counting. To address this issue, the group sought to estimate the number of pieces to be sampled while minimizing errors.