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Hamil Sopa took a random sample of 60 invoices from his years records. The mean value of invoices in this sample was 125.50 and the

Hamil Sopa took a random sample of 60

invoices from his years records. The mean

value of invoices in this sample was 125.50

and the standard deviation was 10.20 are the 90% and 95% confidence intervals for

the mean value of all invoices?

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