Answer:Scientific research is the investigation or examination performed by applying systematic scientific methods to obtain, analyze, and interpret the data. The sample size of the population plays a crucial role in research. The phrase that limits the accuracy of the research is:Option A: A sample size of 300 peopleScientific studies are advantageous when:It is conducted on large population size. The number of individual users in the research is used to calculate the set of statistics.The large sample size allows the scientist to better understand and average the values of data. The large population size also helps in neglecting the errors, which can be frequent on the small population size. The maximum size of the population is usually 10percent of the total population. It can be calculated as the total population of 200,000, the 10% will be 20,000. Thus, for the scientific study conducted by Marcus, the sample size of 300 people will limit the accuracy of the experiment.
Explanation:
You are not supposed to begin the observation of specimens with oil immersion lens.
The microscope is an instrument used in science laboratories to study specimen that cannot be seen with the naked eyes.
The specimen for viewing through a microscope are usually prepared as thin slices or sections.
Among the various parts of the microscope are the x10, x40, and x 100 objective lens.
The x100 objective lens is known as the oil immersion lens because oil is added while using the lens to reduce the amount of light refraction thereby allowing more light to pass through the narrow diameter of the high power objective lens.
The x10 objective which is of lower power, should be used to focus the specimen while the higher power objective which is the x100 oil immersion used for closer observation.
Therefore, you are not supposed to begin the observation of specimens with oil immersion lens.
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