mr. stratford is the president of a national organization of lesbian, bisexual, gay, and transgender people in the united states. he wants to survey 1,000 members of his organization about the position they want the organization to take on several political issues. he knows that transgender people make up only 5% of his organization, but he wants to make sure their views are accurately represented. he decides to randomly sample 100 transgender members and then adjust the final results so transgender people are weighted to their actual proportion in the organization. which type of sampling is mr. stratford using?