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4. Suppose has a normal distribution. A random sample of size 4 is drawn as follows: 28 32 25 31 a. (10 points) Find the

4. Suppose has a normal distribution. A random sample of size 4 is drawn as follows: 28 32 25 31 a. (10 points) Find the sample mean and sample standard deviation s. b. (10 points) Find a 90% confidence interval for the population mean

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