What design principle is stressed for experiments or observational​ studies? Choose the correct answer below. A. Using dependent samples with paired data is generally better than using two independent samples. B. When using paired​ data, keep the sample very small in order to keep the data manageable. C. The methods for dependent samples can be used for any matched pairs. D. Using two independent samples is the best choice for accurate results.

THIS USER ASKED 👇

What design principle is stressed for experiments or observational​ studies? Choose the correct answer below. A. Using dependent samples with paired data is generally better than using two independent samples. B. When using paired​ data, keep the sample very small in order to keep the data manageable. C. The methods for dependent samples can be used for any matched pairs. D. Using two independent samples is the best choice for accurate results.

THIS IS THE BEST ANSWER 👇

A). It is usually better to use dependent samples with paired data than two independent samples.

Explanation:

Observational studies are the research / study design in which the investigator looks at the samples collected from the population in their natural pattern to draw valid conclusions without any kind of manipulation or interference. Although the experimental studies involve a controlled or manipulated variable in order to check its influence on the independent variable and the relationship between the two.

According to the question, the design principle emphasized in both studies is ’employing dependent samples together with the paired data is usually more efficient than employing two independent samples’ as the former set concerns only elements making them ‘self-evident’ ‘(because one sample material can be used to determine other subjects). So option A is the right answer.