A random sample was selected from a population having a normal distribution. Calculate a 90% confidence interval estimate for μ for each of the following situations:
a. ∑x = 134, n = 10, s = 3.1
b. ∑x = 3,744, n = 120, s = 8.2
c. ∑x = 40.5, n = 9, σ = 2.9
d. ∑x = 585.9, ∑x2= 15,472.37, n = 27
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