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?

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?

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?
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?