Question

the famous scientist albert einstein sometimes used \thought experiments\ such as imagining himself chasing a beam of light or riding in an elevator in free - fall. these thought experiments, which would not be possible to conduct physically, helped him challenge current scientific thinking and develop his theories of gravity and of special relativity.

in actual physical experiments, scientists must blank carefully and blank in data collection and analysis. there is variation in nature, so the larger the blank, the more accurately researchers can determine dissimilarities within each group, and analyze variances between experimentals and controls. when interpreting data, researchers use blank to decide if an experimental treatment is significantly different from the control group. when drawing conclusions, the blank being tested may either be supported, or refuted and blank to be tested again.

options (from sliders): revised, hypothesis, avoid errors, select equipment, sample size, statistical analysis

Explanation:

Answer:

First blank: select equipment
Second blank: sample size
Third blank: statistical analysis
Fourth blank: hypothesis

(Assuming the blanks are filled in the order of the dashed boxes. The first dashed box after "must" is "select equipment", then "sample size" for the next, "statistical analysis" for the one related to data interpretation, and "hypothesis" for the last about testing again.)