Test whether the average age of a customer buying a vehicle from Whitner Autoplex less than 45 years ...

Test whether the average age of a customer buying a vehicle from Whitner Autoplex less than 45 years.
Use n = 80, x-bar = 42.15, σ = 8.22

We use z- test for a population mean. We assume α = 0.05 and since we want to test whether the average age is < 45 ...

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