(All Steps) Schadek Silkscreen Printing, Inc. purchases plastic cups on Which to print logos for sporting events, proms, birthdays, and other special occasions.
Question: Schadek Silkscreen Printing, Inc. purchases plastic cups on Which to print logos for sporting events, proms, birthdays, and other special occasions. Zack Schadek, the owner, received a large shipment this morning. To ensure the quality of the shipment, he selected a random sample of 300 cups. He found 15 to be defective.
- What is the estimated proportion defective in the population?
- Develop a 95 percent confidence interval for the proportion defective.
- Zack has an agreement with his supplier that he is to return lots that are 10 percent or
more defective. Should he return this lot? Explain your decision.
Deliverable: Word Document 
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Confidence Interval for the Difference Between Means Calculator for Unknown Population Variances - MathCracker.com