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2. Find a 90 percent confidence interval for the mean of a normal distribution with o = 3 given the sample (3.3, -0.3, -0.6, -0.9).

2. Find a 90 percent confidence interval for the mean of a normal distribution with o = 3 given the sample (3.3, -0.3, -0.6, -0.9). What would be the confidence interval if o were unknown

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