This is the aim of the investigation.
It must be stated clearly.
Remember, this type of investigation is about comparing a numerical variable of two groups in a population.
The question needs to:
state the two groups being compared.
eg: males and females, lions and tigers
state the variable (numerical) being compared.
eg: height, weight, area
use a word that gives a direction.
egs: more, less, greater, taller, heavier, etc
include the word "tends"
state the POPULATION the two groups belong to.
egs: all students in NZ, all the lions and tigers in the US, etc
Give a reason why the results of your investigation would be useful.
Who would find your investigation useful?
What do you think you are likely to find?
Why do you think that?