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A marketing manager wanted to know if the percentage of returns came down after a quality control improvement program. Of the 300 customers before the

A marketing manager wanted to know if the percentage of returns came down after a quality control improvement program. Of the 300 customers before the program 120 made returns of purchased product. After the quality control improvement, only 40 out of 400 returned the product. Is there a significant drop in returns? Use 95% significance or z = 1.96 when not provided.

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