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I need step by step help through this stats problem. Thank you 9) A university safety official plans to estimate the percentage of dormitory rooms

I need step by step help through this stats problem. Thank you

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9) A university safety official plans to estimate the percentage of dormitory rooms with a microwave oven. Determine the number of rooms that need to be surveyed, if it is desired to be 94% confident that the margin of error is at most 3 percent. [7 pt ]

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