They have reasonable grounds already to suspect that gender and ethnicity will be relevant, based on past annual surveys. As someone else pointed out, and you imply, this looks like an inept attempt to take that into account.

I guess the initial survey asks for only these kinds of demographic information to establish a pool of people they might select from. They might then select a suitable number of people to from the various demographic groups.

They have reasonable grounds already to suspect that gender and ethnicity will be relevant, based on past annual surveys. As someone else pointed out, and you imply, this looks like an inept attempt to take that into account.

I guess the initial survey asks for only these kinds of demographic information to establish a pool of people they might select from. They might then select a suitable number of people from the various demographic groups.

They have reasonable grounds already to suspect that gender and ethnicity will be relevant, based on past annual surveys. As someone else pointed out, and you imply, this looks like an inept attempt to take that into account.

They have reasonable grounds already to suspect that gender and ethnicity will be relevant, based on past annual surveys. As someone else pointed out, and you imply, this looks like an inept attempt to take that into account.

I guess the initial survey asks for only these kinds of demographic information to establish a pool of people they might select from. They might then select a suitable number of people to from the various demographic groups.