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1. Evaluate the population mean margin of error for 99% confidence interval when sigma is 4 and sample size is 36.

A) ± 1.7166...

B) ± 1.0966...

C) ±1.3066...

D) none of these

2. An auditor wants to estimate what proportion of bank's commercial loan files is incomplete. The auditor wants to be in 4% of true proportion when using the 95% confidence level. How many files should the auditor sample? No estimate of proportion is available, so employ 0.5 for population proportion.

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