Which of the following causes sampling error? a. Taking a random ...

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Which of the following causes sampling error?
 a. Taking a random sample from a population instead of studying the entire population.
  b. Making a mistake in the process of collecting the data.
  c. Nonresponse bias.
  d. All of these choices are true.

Question 2

The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a videocassette recorder over the past 12 months are satisfied with their products. If there are 4 different brands of videocassette recorders made by the company, the best sampling strategy would be to use a:
 a. simple random sample.
  b. stratified random sample.
  c. cluster sample.
  d. self-selected sample.

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Answer to Question 1

A

Answer to Question 2

B