A researcher wishes toestimate, with 95% confidence, the population proportion of adults who support labeling legislation for genetically modified organisms(GMOs). Her estimate must be accurate within 6% of the true proportion.

(a) No preliminary estimate is available. Find the minimum sample size needed.

(b) Find the minimum sample sizeneeded, using a prior study that found that 65% of the respondents said they support labeling legislation for GMOs.

(c) Compare the results from parts(a) and(b).