Question: A random sample of size n1 = 25 taken from a normal population with a standard deviation < 1 = 5 has a mean 1

A random sample of size n1 = 25 taken from a normal population with a standard deviation < σ1 = 5 has a mean 1 = 80. A second random sample of size n2 = 36, taken from a different normal population with a standard deviation σ2 = 3, has a mean 2 = 75. Find a 94% confidence interval for µ1 - µ2.

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