For question a: 1st step is sample statistics (n, and phat). 2nd step is sampling distribution which is np(1-p)>10 and then critical values followed by confidence interval calculations. Finally the hypothesis.

2. Some experts believe that 20% of all freshwater fish in Canada have high levels of mercury that are dangerous for consumption. Suppose a fish market has 250 fish are tested and 58 of them have dangerous levels of mercury. Is there evidence to suggest that the proportion of fish with dangerous levels of mercury is different from 20%? Use a significance level of a = 0.05. a) Use the critical value method and show all six steps for hypothesis testing. b) Use the p-value method and show all six steps for hypothesis testing. Check that you obtain the same conclusion as part a). c) Identify and describe the type of error that may have been committed in this hypothesis test