2. (11pts) A large fishing farm with thousands of fish has been treating its fish to stop a spreading

fungal infection. A simple random sample of 100 fish is taken to determine the proportion that

is infected in this population. A careful examination determines that 12 of the fish sampled

are infected. Is there statistically significant evidence that the infection would be contained if

fewer than 10% of the fish were infected. Assume that significance level of 0.05. Use 8 step

procedures to answer this question.

3. (11pts) Advances in medical care such as prenatal ultrasound examination now make it possible

to determine a child's sex early in a pregnancy. There is a fear that in some cultures some parents

may use this technology to select the sex of their children. A study from Punjab, India, reports

that, in 1993, in one hospital, 56.9% of the 640 live births that year were boys. It's a medical

fact that male babies are slightly more common that female babies. The study's authors report

a baseline for this region of 51.7% male live births. Is there evidence that the proportion of the

male births has changed? Assume that significance level of 0.01. Use 8 step procedures to

answer this question.