1. Standard variables- These help ensure that the results of your experiment are not biased.
2. Controls- These ensure that the experiment proves your specific hypothesis. If there are multiple variables then your results can not be narrowed to a specific source.
3. Number of subjects. Having a large test group ensures the validity of the experiment. In a group of 2 one subject would account for more than half the data! If that subject is an outlier than half of your data is irrelevant!
4. Repetition- This shows that your experiments fall under operational
science.
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Answer:
As of 2013, WMAP determined these parameters with an accuracy of better than than 1.5%. In turn, knowing the composition with this precision, we can estimate the age of the universe to about 0.4%: 13.77 ± 0.059 billion years!
Explanation:
yuh
Arteries. The arteries are major blood vessels connected to your heart. The pulmonary artery carries blood from the right side of the heart to the lungs to pick up a fresh supply of oxygen. The aorta is the main artery that carries oxygen-rich blood from the left side of the heart to the body.