I believe the answer is: double blind procedures
double blind procedures refers to a form of study in which both participants and the researchers do not know which subjects are receiving the treatment. The purpose of double blind procedures is to prevent the bias held by the experimenters along with placebo effects.
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Some rewards can be free T-shirts, or maybe a trophy or medal.
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D. The federal government can only function effectively if it has the ability to collect taxes.
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Market movements and price fluctuations are influenced by a number of factors, such as economic reports, large institutional block trades and such like. Of all these factors, one that is often underestimated is the impact of commodity prices. Fluctuating commodity prices not only have a significant impact on business, they also impact the trading markets and the overall economy. Generally, the impact of commodity price fluctuations depends on whether that economy is a net importer or net exporter of commodities.
For economies that are net importers, commodity price increases act almost like trade tariffs. This is because it makes the import of raw materials and sources of energy, required for the everyday functioning of different economic sectors, more expensive.
Economies that are net exporters, on the other hand, benefit from increasing prices, since their income increases with the sale of those commodities. At the same time, a steep rise in prices could reduce the demand for commodities and lead to losses.
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