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A random sample was selected from a population having a normal distribution. Calculate a 95% confidence interval estimate for population for each of the

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A random sample was selected from a population having a normal distribution. Calculate a 95% confidence interval estimate for population for each of the following situations: (a) (2 marks) = 13.4, n = 25, = 3.0. (b) (3 marks) = 13.4, n = 30, s = 9.0. (c) (3 marks) = 13.4, n = 49, s = = 6.5. (d) (2 marks) : = 13.4, n = 36, = 3.8.

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