Final answer:
The statement "15 people have sent in winning entries for a magazine competition" is false.
Step-by-step explanation:
The statement mentions that 15 people have sent in winning entries, which implies that their entries have already been declared as winners. However, the following text states that the competition is still ongoing and the top five entries will receive a prize. Therefore, at this point, there are no winning entries since the competition is still running and the winners have not been determined yet.
It is important to carefully read and analyze the given information to accurately interpret the meaning. In this case, the statement is misleading because it contradicts the information provided in the text.
Therefore, the statement "15 people have sent in winning entries for a magazine competition" is false.