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18. For random samples of size n = 16 selected from a normal distribution with a mean of u. = 75 and a stan- dard

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18. For random samples of size n = 16 selected from a normal distribution with a mean of u. = 75 and a stan- dard deviation of o = 20, find each of the following: a. The range of sample means that defines the middle 95% of the distribution of sample means. b. The range of sample means that defines the middle 99% of the distribution of sample means

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