Aresearcher conducting a study testing the effects of caffeine on attention is concerned that both her expectations and subjects expectations will effect the findings of this study. so neither the researcher nor the subjects knew who was in the control and experimental groups. what technique was being used in this study?

The technique use in this study is referred to as a double blind

Explanation:

A double blind study is the one that both participants and experimenters or researchers are not made aware who is given a certain treatment.

In double blind researchers will not know if what they are receiving is part of the test itself as they interact with participants or they are receiving a placebo.

This process is useful to eliminate and avoid bias results.

For example, in the above text the effect of caffein on attention is being tested so the researchers will not know whether the drink given to them is actual for the test or just the placebo , they don't know who is in control of the experiment.

countries such as spain, france and portugal colonized the region. although most of latin america was colonized by spain, the countries of portugal and france also had major influences on the region. due to war and disease, native populations were decimated.

the anti federalists was a movement that was opposed to the creation of a us federal government. although they were not as organized as the federalists, they also had a large group of leaders, especially in state politics.

the statement "now, in a large extended country, it is impossible to have a representation, possessing the sentiments, and of integrity, to declare the minds of the people” represents the concerns of the anti federalists.

they strongly believed that the federalists were representing the interests of aristocratic elements of society at the expense of the majority of ordinary people, who lived in a rural society.

their fear for the creation of a strong federal government and the president’s power of veto in their opinion would create a tyrannical rule that would dominate the people. they defended the importance of restraining the government’s power towards people at any cost.