Question: Chapter 6 - Significance Testing In attempting to control the strength of the wastes discharged into a nearby river, a paper firm has taken a

Chapter 6 - Significance Testing In attempting to control the strength

Chapter 6 - Significance Testing In attempting to control the strength of the wastes discharged into a nearby river, a paper firm has taken a number of measures. Members of the firm believe that they have reduced the oxygen- consuming power of their wastes from a previous mean of 500. If given sample size 25 with the variance of 0.9, with significance level of a = 0.01. Test the claim if mean less than 550

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