Question

Federal officials have investigated the problems associated with disposal of hazardous wastes. One disposal site is the abandoned Stringfellow acid pits in Riverside County, Calif. The EPA sampled water from 11 wells in nearby Glen Avon. The EPA standard for maximum allowable radiation level of drinking water is 14.46 pCi/L. Suppose that the sample of 11 water specimens resulted in a sample mean radiation level of 18.14 pCi/L and a sample standard deviation 7.25. Is this sufficient evidence to indicate that the water in Glen Avon has a mean radiation level that exceeds the EPA standard? Use t test. (α = 0.05)

H₀: μ= 14.46                  versus             H₁: μ> 14.46

Let μdenote the true mean radiation level for well water in Glen Avo

		Failed to Reject Null Hypothesis
		Reject Null Hypothesis

Answer 1