The Environmental Protection Agency (EPA) has determined that safe drinking water should contain at most 1.3 mg/liter of copper, on average. A water supply company is testing water from a new source and collects water in small bottles at each of 30 randomly selected locations. The company performs a test at the =0.05 level of0::=1.3>1.3

where is the true mean copper content of the water from the new source.

Which of the following is true regarding Type I and Type II errors in this setting?

A. A Type II error would be not finding convincing evidence that the true mean copper content of the water from the new source is greater than 1.3 mg/liter when it really is.

B. The probability of making a Type I error would be reduced if a larger level was chosen.

C. A Type II error would be not finding convincing evidence that the true mean copper content of the water from the new source is greater than 1.3 mg/liter when it really isn't.

D. A Type I error would be finding convincing evidence that the mean copper content of the water from the new source is greater than 1.3 mg/liter when it really is.