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 24 locations in the river and calculated a mean of 98.4 mg/l, with a standard deviation of 5.1 mg/l. the fish are able to tolerate calcium concentrations up to 95 mg/l. a. assuming a normal distribution, calculate a 95% confidence interval for the mean calcium concentration in the river. given: "" ∗ = 2.069 (3pts) b. does your data suggest that the fish are being negatively impacted? explain your answer. (2pt) c. assuming that you held everything else constant, how would the width of the confidence interval change if you doubled your sample size from 24 to 48? would it become wider, narrower, or stay the same? (1pt)