Problems 11, 12, & 13

11. Find the 99% confidence interval (CI) and margin of error (M E) used to estimate the population proportion when a survey of 8725 registered voters reported that 4799 are in favor of the EV mandate in California. Interpret your results. (8 pts) 12. Find the minimum sample size needed (an) to estimate the mean monthly earnings of students at Norco College. We want 90% confidence that we are within a margin of error of $150 when the population standard deviation is known to be $625 (a = 625). (5 pts) 13. Find the minimum sample size (n) needed to be within a margin of error of 3.5% and a confidence level of 95% when 13 and L? are unknown. (5 pts)