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.

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.

Answer 1