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Mathematics, 22.04.2020 04:45 rocky68
Unfortunately, arsenic occurs naturally in some ground water†. A mean arsenic level of μ = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 41 tests gave a sample mean of x = 7.2 ppb arsenic, with s = 2.1 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use α = 0.01.
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Unfortunately, arsenic occurs naturally in some ground water†. A mean arsenic level of μ = 8.0 parts...
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