More cards in this set

researcher has no influence over who selected preventing them from?

random sampling is difficult and what?

what may be extremely difficult to get?

laws of probability suggest random sampling more likley to produce what kind of sample than opportunity?

but still possible through randomly what can happen?

selected pps may also do what?

SYSTEMATIC SAMPLE

what happens?

sampling frame produced which is?

sampling system nominated or interval may be random to reduce?