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4. Construct a confidence interval around the sample mean X = 25 for the following conditions: a. N = 25, s = 15, 95% confidence

4. Construct a confidence interval around the sample mean X = 25 for the

following conditions:

a. N = 25, s = 15, 95% confidence level

b. N = 25, s = 15, 90% confidence level

c. X = 4.5, = 0.05, df = 20

d. s = 12, df = 16

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