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Hello, (3 points) A random sample of 90 observations produced a mean of E = 23.8 from a population with a normal distribution and a

Hello,
(3 points) A random sample of 90 observations produced a mean of E = 23.8 from a population with a normal distribution and a standard deviation 0' = 4.8. (a) Find a 99% confidence interval for [,1 S .u S (b) Find a 95% confidence interval for ,u S .u S (c) Find a 90% confidence interval for y

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