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A manufacturer claims that their product has the mean value m = 42.1. A customer wanted...

A manufacturer claims that their product has the mean value m = 42.1. A customer wanted to check this claim. He collected a sample (n = 25) from the manufacturer and obtained the sample mean of 47.5 and standard deviation s = 8.4. Does the customer’s test support the manufacturer’s claim? (use a = 0.05). Please draw the distribution curve and indicate rejection regions.

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