A manufacturer of microwave ovens wants to know what percentage of all of their microwave ovens is defective. When 450 of their microwave ovens are selected at random and examined, 0.4% is found to be defective.

a. Describe the population of interest.

b.Describe the sample.

c. What is the parameter?

d.What is the statistic?

e. Is the 0.4% a parameter or a statistic in this scenario? Why?

f. Explain briefly how the statistic can be used to make inferences about the parameter to test the claim.

(6 marks)