To test the effect of music on productivity, workers are observed. For one month background music is played. For another month, no music is played. This is an example of:.(a) an independent sample. (b) an observational study. (c) a completely randomized design. (d) a block design. (e) a paired sample.

i believe the answer is: a.  abstract forms were often used to represent human figures.

representing human figures in abstract forms is often used in the geometric period, not hellenistic  period.   during the hellenistic  period,   aesthetic value derived from creating arts which mimic the actual shape of a certain object or individuals.

hope this ! < 3