Agriculture: Ground Water Unfortunately, arsenic occurs
Chapter , Problem 14(choose chapter or problem)
Agriculture: Ground Water Unfortunately, arsenic occurs naturally in some ground water (Reference: Union Carbide Technical Report K/UR-1). A mean arsenic level of \(\mu = 8.0\) 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 37 tests gave a sample mean of \(\overline{x} = 7.2\) ppb arsenic, with s = 1.9 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use \(\alpha = 0.01\).
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