you are a travel agent and wish to estimate, with 95% confidence, the proportion of vacationers who plan to travel outside the united states in next 12 months your estimate must be accurate within 3% of the true proportion A. no preliminary estimate is available firnd the minumum sample size needed, b. find the minimum sample size needed , using a prior study that found that 26% of the respondants said they planned to travel outside the US in next 12months, c. compare results from a & b.