Question: The market research group of a clothing company is interested in the average monthly spending on clothing among all households. The monthly clothing expenditures from a random sample of 100 credit card holders were obtained and the sample mean was calculated.

1. Identify the population, the frame, the parameter, and the point estimate.
2. What type of a sampling design is this? Describe which aspects of the design directed you to this conclusion.
3. Discuss the possible drawbacks of this study.
4. Consider the following alternate design: Monthly clothing expenditures from a simple random sample of 25 card holders from each of the four major credit cards were obtained. What type of a sampling design is this? Describe which aspects of the design directed you to this conclusion.

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