5. A recent study claims that the average age of murder victims in a small city was less than or equal to 23.2 years. A sample of 18 recent victims had a mean of 22.6 years and a standard deviation of 2 years. At a = 0.05, is the average age higher than originally believed? Assume that the variable is approximately normally (x-t₁1,95 S/√n, ∞) distributed. Construct a corresponding confidence interval for the population parameter. (-₁.95 $/√∞0)

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