Question 10 of 10 1 point Question Attempt 2 of 3 How s the economy A pollster wants to construct a 90 confidence interval for the proportion of adults who believe that economic conditions are getting better Part 0 2 Part 1 of 2 a A poll taken in July 2010 estimates this proportion to be 0 29 Using this estimate what sample size is needed so that the confidence interval will have a margin of error of 0 02 adults is needed to obtain a 90 confidence interval with a margin of error of 0 02 X Espa ol 8 ME B