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Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of u = 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 36 tests gave a sample mean of x = 7.1 ppb arsenic, with s = 2.2 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use a = 0.01. LO USE SALT (a) What is the level of significance? State the null and alternate hypotheses. O Ho: M 8 ppb; H1: M = 8 ppb O Ho: M = 8 ppb; H1: M > 8 ppb O Ho: M = 8 ppb; H1: M 0.100 0.050