Find a confidence interval for assuming that each sample is from a normal population. a. x-bar =

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Find a confidence interval for assuming that each sample is from a normal population.
a. x-bar = 14, σ = 4, n = 5, 90 percent confidence
b. x-bar = 37, σ = 5, n = 15, 99 percent confidence
c. x-bar = 121, σ = 15, n = 25, 95 percent confidence
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