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to have something to compare with the growth of fertilized plants
To not have anything that was not supposed to react with the chemicals in the container. Example: Oxygen, and other gases in the air reacting with an experiment that you are working on.
because they are to small for anyone to study.
you study chemistry so you can laern how to measure volume and study matter and mass
There is no commonly accepted term to describe the study of marijuana. Botanists study plants and pharmacologist study the development of drugs. Specifically, phanergamology is the study of plants that produce flowers as the Cannabis genus does. All of these fields fall under the category of Biochemistry. If you want to study marijuana, you would have to pick a concentration and then pick a specific subject to study, such as marijuana.
change one or more factors and observe the effects
In Vivo
in an experiment, the researcher manipulates a variable
An experiment allows for the researcher to manipulate variables and establish cause-and-effect relationships more effectively than an observational study. This control helps to minimize confounding variables and biases, making the results more reliable. Additionally, experiments often involve random assignment, which enhances the ability to draw conclusions about the relationships being studied.
In an experiment, the researcher manipulates a variable.
cause and effect
An experiment can establish causation by manipulating variables and controlling for potential confounding factors, while an observational study can only show correlation. Experiments allow researchers to directly test hypotheses and determine the effects of specific interventions, providing stronger evidence for causal relationships. Additionally, experiments can help establish a cause-and-effect relationship with higher confidence due to their randomized controlled design.
designed experiment
To make "the most correctable solution"
In an experiment investigators apply treatments to experimental units (people, animals, plots of land, etc.) and then proceed to observe the effect of the treatments on the experimental units. n an observational study investigators observe subjects and measure variables of interest without assigning treatments to the subjects. The treatment that each subject receives is determined beyond the control of the investigator. For example, suppose we want to study the effect of smoking on lung capacity in women. Summary: 1.The main difference between observational study and experiments is in the way the observation is done. 2.In an experiment, the researcher will undertake some experiment and not just make observations. In observational study, the researcher simply makes an observation and arrives at a conclusion. 3.In observational study, no experiment is conducted. In this type of study the researcher relies more on data collected. 4.In an experiment, the researcher observes things through various studies. 5.There is human intervention in experiments whereas there is no human intervention in observational study. 6.Hawthorne studies are a good example for experiments. 7.The study to determine the relation between smoking and lung cancer is a typical example for observational study.
Observational study
If we're talking about statistics: There is no superior observational study, each study has its advantages and disadvantages.