Suppose just over 2500 cell phones are produced at a factorytoday. Management would like to ensure that the phones' displayscreens meet their quality standards before shipping them to retailstores. Since it takes about 10 minutes to inspect an individualphone's display screen, managers decide to inspect a sample of 50phones from the day's production.
(a) Explain why it would be difficult for managers to inspect anSRS of 50 phones produced today.
(b) An eager employee suggests that it would be easy to inspectthe last 50 phones that were produced today. Obviously, thisemployee never took a stats class! Explain why this is not a goodmethod.
(c) Another employee that did take a stats class recommendsinspecting every 50th phone produced today. What sampling methodare they using?
