5 Suppose it is known that 12 out of the 20 teams in the sam

5. Suppose it is known that 12 out of the 20 teams in the sample had a season winning percentage no better than 0.500. (a) Find a 95% confidence interval for the true proportion of all teams that had a season winning percentage no better than 0.500. (b) What is your opinion of the precision of this confidence interval? Give a reason for your answer.