Schadek Silkscreen Printing Inc purchases plastic cups on which to print logos for sporting events, proms, birthdays, and other special occasions. ZackSchadek, the owner, received a large shipment this morning. To ensure the quality of shipment, he selected a random sample of 300 cups. He found 15 to be defective.
a. What is the estimated proportion of defective cups in the population?
b. What is the appropriate distribution for calculating 95% confidence interval?
a. Uniform distribution
b. Normal distribution
c. T distribution
d. Chi sqi distribution
c. What are the degrees of freedom (df) for the appropriate distribution?
d. Develop a 95% confidence interval for the proportion of defective cups.
e. Zack has an agreement with his supplier that he should return lots that are 10% or more defective. Should he return this lot? Select the appropriate letter below
a. Zack should not return the lot because the percent of defective are within the appropriate limits.
b. Zack should return the lot because the percent defective is not within the appropriate limits?
c. The confidence interval does not provide the appropriate information for Zack to make a decision with respect to returning the lot