Answer: the population for the study is the Hilton Honors Club members.
Step-by-step explanation:
To gather facts on factors about increasing loyalty, Hilton will have to carry out a survey that will be sent to all of its Hilton Honors club members because these members are the ones who are already loyal to the Hilton brand whenever they travel and can be easily assesible. From Thier valid reports, Hilton will understand how best to increase loyalty from its other remaining 90% visitors.