According to a CBS news poll, 73% of the 321 randomly selected adults aged 18-30 favor allowing gay and lesbian couples to marry legally compared to 53% of the 562 randomly selected adults of all ages that favor such legalization, a difference of 20%. To compute the likelihood that you'd see such a difference or more just due to the luck of the draw, you first need to calculate the SE of the 2 samples. Required:
In the young adult poll 73% favored gay marriage. Calculate the SE for this percentage.