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1) The average and standard deviation of thickness of a steel plate from 25 samples are measured as 33 mm and 3 mm, respectively. (6

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1) The average and standard deviation of thickness of a steel plate from 25 samples are measured as 33 mm and 3 mm, respectively. (6 marks) a) Investigate the manufacturers claim that the actual mean thickness is 30 mm, with 95% confidence. b) Find p-value and make a conclusion based on that

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