A light switch manufacturer claims that less than 1% of all light switches manufactured by their company, are defective.

The manufacturing company has three shifts over a 24 hour day, 7 days a week, and each shift creates 3 batches of light switches, with about 3,000 light switches per batch. In the past month, a new machine was installed to manufacture the light switches.

The past couple of weeks, a major hardware store that stocks this manufacturer's light switches, has reported that an unusually large number of customers have complained of faults. The owner of the company took a random sample of 300 light switches and found 35% were defective.

Please answer each of the following, in the context of this question.

a) Describe the "Who" and "Why" of the data.

b) What is the value of the statistic and what is the value of the parameter?

c) The sampling method used by the owner has not been explained. Briefly describe a stratified sampling method that the owner could have used.