Question: A random sample of size n =9 is drawn from a normal distribution with = 27.6. Within what interval (a, +a) can we expect

A random sample of size n =9 is drawn from a normal with μ = 27.6. Within what interval (−a, +a) can we expect to find − 27.6/S/√9 80% of the time? 90% of the time?

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