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Assume that a 90% confidence interval for the unknown population mean , based on a sample of size n = 9 drawn from a normal

Assume that a 90% confidence interval for the unknown population mean , based on a sample of size n = 9 drawn from a normal population with unknown SD = . Sample summaries were found as follows: Sample Mean = X = 81 and Sample SD = s = 15

1. Determine the critical value needed

2. Find the margin of error and width for the confidence interval

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