Schadek Silkscreen Printing Inc. purchases plastic cups on which to print logos

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.

A What is the estimated proportion defective cups in the population?
       Enter answer as a decimal with 2 place precision.

B What is the appropriate distribution for calculating a 95% confidence interval?

a     Uniform distribution

b     Normal distribution

c     t distribution

d     Chi Square distribution

C What is the degrees of freedom (df) for the appropriate distribution.
       Enter Na or 0 for the df if the df is not required by the appropriate distribution.

D Develop a 95% confidence interval for the proportion of defective cups.

Enter the lower and upper limits for the conference interval by entering the lower limit first.
Rounded each conference limit to 3 decimal places.

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 correct answer and enter the appropriate letter.

a    Zack should not return the lot because the percent 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 apropriate information for Zack to make a decision with respect to returning the lot.