Answer:
Internal validity.
Explanation:
Internal validity is the study in which trust relationship is build between treatment and outcome. This relationship is known as <em>cause-and-effect. </em>
In this type research, the studies are based on whether the finding is questionable or not. The research which can overrule the possibility of alternative explanations of our findings is internally valid.
The threats of internal valid study are:
- <u>Natural Improvement </u>
- <u>Maturation</u>
- <u>Historical Events</u>
- <u>Placebo effects</u>
- <u>Nonspecific effects</u>.
So, the correct answer is 'Internal validity'.
Answer:
us is a country english is a language
Explanation:
Answer:
Carter G. Woodson.
Explanation:
Carter G. Woodson was an author and historian. He is known as the “Father of Negro History” because he defended that education could transform society, improve race relations and benefit the lower classes. He was the first African American born of slaves to earn a PHD. He also defended that all people should learn black history and because of that he celebrated Negro History Week.
Here are some of their achievements:
- theory of radioactivity
-discovery of a new element, polonium
-discovery of another element, radium
- developing new ways of separating radioactive isotopes
-discovery of nuclear energy ( by Pierre and one of his students)