Answer:
Denmark is one of the most successful bureaucracies in the world
Answer:
B. control group.
Explanation:
In the given experiment there two <em>groups of participants:</em> the <em>experimental group</em> - students who are consistently given excellent grades in math by their teachers, and the <em>control group</em> - students who are consistently given average scores. The control group is not under influence of the factor of consistently high grades (independent variable), impact of which on self esteem Noelle is testing. Here, the control group is used as a benchmark to <u>measure the effect of the independent variable under investigation</u>.
Answer:
Variation of natural phenomena is also a possible source of error.
Explanation:
Variation of temperature, humidity, gravity, wind, refraction, magnetic declination etc. are most common natural phenomena which may cause measurement errors. If they are not properly observed while taking measurements, the results will be incorrect.