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.
