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Schadek Silkscreen Printing, Inc. buys plastic cups to print logotypes of sports events, graduations, birthdays and other special events. The owner, Zack Schadek, received an important order or mailing from a customer this morning. To make sure of the quality of the order or mailing, he selected a chance sample of 300 cups and it discovered 15 defective units.
a) Which is the estimated or dear proportion of defective cups in the population?
b) Develop a confidence interval of 95% for the proportion of defective cups.
c) Zack has an agreement with his provider of whom he is going to return the lots in those who exist 10% or more of defective units. Must he return this lot? Explain his decision.
Then explain your answer to someone who has never had course in statistics (but who is familiar with mean, standard deviation, and Z scores.)
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