Letxbe a random variable that represents micrograms of lead per liter of water (g/L). An industrial plant discharges water into a creek.

Let x be a random variable that represents micrograms of lead per liter of water (Ng/L). An industrial plant discharges water into a creek. The Environmental Protection Agency (EPA) has studied the discharged water and found x to have normal distribution, with o = 0.7 ug/L. + Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value a small amount and thereby produce a slightly more "conservative" answer. (a) The industrial plant says that the population mean value of x is u = 2.0 ug/L. However, a random sample of n = 10 water samples showed that x = 2.55 ug/L. Does this indicate that the lead concentration population mea is higher than the industrial plant claims? Use a = 1%. 1) What is the level of significance? 0.01 State the null and alternate hypotheses. O Ho: M = 2.0; H1: H 2.0 O Ho : H = 2.0 ; H1: 1 # 2.0 O Ho : M = 2. 0 ; H 1 : M > 2.0 O Ho: p = 2.0; H1: p 0.500 O 0.250