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Body weights expressed as a percentage of ideal in an SRS of n = 9 girls selected at random are as follows (114, 100, 104,

Body weights expressed as a percentage of ideal in an SRS of n = 9 girls selected at random are as follows (114, 100, 104, 94, 114, 105, 103, 105, 96). Calculate a 95% confidence for population mean mu. What is the margin of error of your confidence interval? How large a sample would be needed to reduce this margin of error to three?

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