In a(n) observational study, a researcher carefully and systematically watches and records behavior, taking care to avoid affecting the subjects being studied.
A type of study that observes an individual or measures a specific result. No attempt is made to affect the outcome (for example, no treatment is given).
A very simple example is some kind of research. Suppose someone on a busy street in the neighborhood of New York asks a random passerby for the number of pets and uses that data to determine if more pet food stores should be added to the area.
It is called an observational study because investigators observe people without any manipulation or intervention. This is in contrast to randomized controlled trials in which researchers intervene to determine the impact on results.
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Answer:
It gave the egyptians all their water supply
They used the water from the Nile to water their crops and travel
Explanation:
The Nile River has been an important source of food, transportation, and water for the continent of Africa for thousands of years. Without the rich soil and clean waters that the river brought to the dry desert, Ancient Egypt would not have survived, and this extremely important civilization would have never happened.
Answer:
C
Explanation:
If you know WHY it is hard to understand, you can on the conversation to help you learn what went wrong.
Japan because they believe that if you are feeling depressed smiling is a way od covering up.