Final answer:
The selection of 15 adults is not a binomial experiment if it involves sampling without replacement as probabilities change with each selection, violating the requirements of constant probability and independence in trials.
Step-by-step explanation:
The selection of the 15 adults does not constitute a binomial experiment if the sampling is done without replacement. A binomial experiment requires that each trial be independent of the others and that there be only two outcomes, often classified as 'success' or 'failure.'
For the conditions to be met, the probability of success must remain constant across trials. However, if we are sampling without replacement, as is the case with the hypergeometric distribution, the probability changes with each selection since the composition of the population is altered after each pick.