The true statements about the usefulness of studying marketing are:
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Knowing marketing principles is useful in understanding manufacturing technology. - Understanding marketing principles can help in comprehending how products are positioned and sold in relation to manufacturing technology.
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Marketing concepts can help "sell" yourself to a potential employer. - Knowledge of marketing can be invaluable in crafting a personal brand and effectively communicating one’s skills and experiences.
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Marketing offers many interesting jobs. - The field of marketing provides a variety of career opportunities in different industries, making it an interesting field to study.
The statement "Understanding marketing has no value to people in nonmarketing jobs." is false. Marketing knowledge can benefit individuals in various roles outside of traditional marketing jobs, including sales, management, and operations.
So, the correct statements are 1, 3, and 4.