An experiment in which neither the participants nor the individual researchers know if participants are in the experimental or the control group until after the results are tallied, is known as a .

The answer is a double-blind study.

Explanation:

A double-blind study is a research method in which neither the participants or the researchers are aware about which group is receiving the treatment. This is done in order to avoid biases such as the placebo effect, as well as preventing accidental cues given by the researchers.

The greatest advantage of this approach is its high validity.

is this an essay or multiple choice

swahili is an extremely rich and complex civilization, a set of ethnic groups articulated by a language and a series of cultural elements that fuse the african traditions, islam and indian culture. this growth was largely a result of the indian ocean trading network that brought in not just man-made riches, but also religious ideas, specifically islam, which had a significant impact on the local culture. furthermore, the development of the swahili language gave a common cultural unity to the people.