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Hamil sopa took a random sample of 60 invoices from his

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Hamil Sopa took a random sample of 60 invoices from his year's records. The mean value of invoices in this sample was £125.50 and the standard deviation was £10.20. What are the 90% and 95% confidence intervals for the mean value of all invoices?

Reference no: EM13584442

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