Mathematics, 07.05.2021 20:10, davestrider404
Two years ago, the average level of a certain noxious chemical at the mouth of the Kentucky River was 180 parts per million. Since then, new water treatment facilities have been added upstream and dumping regulations have been strictly enforced, leading to the belief that the average level of the pollutant has been reduced. To verify this belief, 49 random samples are taken at the mouth of the river. The mean and standard deviation of these samples are, respectively, 162 parts per million (ppm) and 42 ppm. What hypotheses would you test if you want to show that the mean level of this particular pollutant has been reduced
Answers: 2
Mathematics, 21.06.2019 21:50, bcox32314
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Mathematics, 21.06.2019 23:20, kawaiiiiiiii4715
Triangle xyz, with vertices x(-2, 0), y(-2, -1), and z(-5, -2), undergoes a transformation to form triangle x? y? z? , with vertices x? (4, -2), y? (4, -3), and z? (1, -4). the type of transformation that triangle xyz undergoes is a . triangle x? y? z? then undergoes a transformation to form triangle x? y? z? , with vertices x? (4, 2), y? (4, 3), and z? (1, 4). the type of transformation that triangle x? y? z? undergoes is a .
Answers: 2
Two years ago, the average level of a certain noxious chemical at the mouth of the Kentucky River wa...
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