canada has a contribution program and there interested in checking phone line records without permission of anyone. 1000 people were selected in a canadian region and were called and each were asked to respond to several questions.

is is observational or experimental.
whats the sample.
is it random?

heres what i think:
its obvervational, because they can answer anyway they like.
the sample is the 1000 people selected.
and its completely random because they could dial random phone numbers.

is this correct?
thanks.