1. An industrial plant dumps its waste into a nearby river, but claims that it is not impacting the native fish that live in the river. You've measure the calcium concentration from a random sample of 23 locations in the river and calculated a mean of 97.9 mg/L, with a standard deviation of 3.1 mg/L. The fish are able to tolerate calcium concentrations up to 95.0 mg/L without being negatively impacted. All relevant assumptions were confirmed. a. Run the appropriate test to determine if the average calcium concentration in this river is dangerous for the sh. Include all steps for full credit. Given: critical value = 2.07 (41%) b. Calculate a measure of effect size for your analysis. (2pt) c. List a potential confounding variable for this study and briey explain a possible consequence it could have on the results. (2pt)