John was assigned the task of investigating the error in payments for routine purchases made by the purchasing department. John randomly selected 12 payments, investigated them thoroughly, and detemined a payment error for each of these payments, resulting in a mean value of 21 and standard deviation of 12.76. The payment error was defined as the difference between the amount paid and what should have been paid. What is 90% confidence interval for the population mean payment error?

MATLAB: An Introduction with Applications
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John was assigned the task of investigating the erTor in payments for routine purchases made by the purchasing department. John randomly
selected 12 payments, investigated them thoroughly, and determined a payment error for each of these payments, resulting in a mean value of 21
and standard deviation of 12.76. The payment error was defined as the difference between the amount paid and what should have been paid.
What is 90% confidence interval for the population mean payment error?
Transcribed Image Text:John was assigned the task of investigating the erTor in payments for routine purchases made by the purchasing department. John randomly selected 12 payments, investigated them thoroughly, and determined a payment error for each of these payments, resulting in a mean value of 21 and standard deviation of 12.76. The payment error was defined as the difference between the amount paid and what should have been paid. What is 90% confidence interval for the population mean payment error?
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