Which method will tend to give better statistical results? Observational studies Experiments Neither observational studies or experiments. Observation

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms