Schadek Silkscreen Printing Inc. purchases plastic cups and imprints them with 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 and inspected them for defects. He found 15 to be defective.

 

What is the estimated proportion defective in the population? (Round your answer to 2 decimal places.)

 

 

 

 

Develop a 95% confidence interval for the proportion defective. (Round your answers to 3 decimal places.)

 

 

 

 

Zack has an agreement with his supplier that if 10% or more of the cups are defective, he can return the order. Should he return this lot?

 

No, the lot is not defective by 10% or more. Yes, 15 is outside the confidence interval. Yes, the lot is 10% defective.

 

 

 

Q56: Evidence that stems from the original evidence is called    _evidence.