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Effective in reducing the scrap level

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The average daily amount of scrap from a particular manufacturing process is 25.5 kg with a standard deviation of 1.6 kg. A modification of the process is tried in an attempt to reduce this amount. During a 10-day trial period, the kilograms of scrap produced each day were: 25.0, 21.9, 23.5, 25.2, 22.0, 23.0, 24.5, 25.0, 26.1, 22.8. From the nature of the modification, no change in day-to-day variability of the amount of scrap will result. The normal distribution will apply. A first glance at the figures suggests that the modification is effective in reducing the scrap level. Does a significance test confirm this at the 1% level?

Reference no: EM132523182

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