1. The difference between a sample mean and the population mean or the difference between the means of two random samples is called: A. nonresponse error. B. selection bias. C. sampling error. D. nonsampling error.
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.
3. When every possible sample with the same number of observations is equally likely to be chosen, the result is called a: A. simple random sample. B. stratified random sample. C. cluster sample. D. biased sample.
4. Which of the following types of samples is almost always biased? A. Simple random samples. B. Stratified random samples. C. Cluster samples. D. Self-selected samples.
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