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Bride's magazine: Sample Size for wedding cost if desired margin

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Bride's magazine reported that the mean cost of a wedding is $25,000. Assume that the population standard deviation is $8400. Bride's plans to use an annual survey to monitor the cost of a wedding. Use 99% confidence. What is the recommended sample size if the desired margin of error is $651.

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The sample size for wedding cost if desired margin is examined.

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