Exam 10: Sample Surveys

A computer network manager wants to test the reliability of some new and expensive fiber-optic Ethernet cables that computer department just received.The computer department received 3 boxes containing 10 cables each.The manager does not have the time to test every cable in each box.The manager will choose one box at random and test 2 cables chosen randomly within that box.What is the sample?

A newspaper reporter randomly sampled households by telephone during various times of the day.The people sampled are within the area of the newspaper's distribution.The newspaper reporter asked,"Are you patriotic in a time of war or armed conflict?" What,if any,will be the most noticeable bias for this survey?

Geologists have an interest in the structure and the history of the earth.A geologist can go back in time by drilling deep into the ground,retrieving a core sample,estimating the ages of the various layers,and examining the composition.A timeline can be built of the entire area from where the core sample was drilled.A geologist may retrieve several core samples to confirm the history of the earth's structure in that sampled area.Mountains,lakes,and unstable ground can easily impede a simple random sampling of a desired geographical area,therefore what is the most realistic sampling method that represents the actual drillings,comparisons,and scientific examinations of several core samples within the same geographical area?

A magazine publisher wants to create a new regionalized version of its national magazine for the west coast.The publisher sends a survey to some of its west-coast subscribers chosen at random regarding interest for this new version of its national magazine.A list of all of the west-coast subscribers who receive the national magazine and may or may not have been chosen for this survey are known as what?