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Frederick Jackson Turner. " The Significance of the Frontier in American History " is a seminal essay by the American historian Frederick Jackson Turner which advanced the Frontier thesis of American history. Turner's thesis had a significant impact on how people in the late 19th and early 20th centuries understood American identity, character ...
D010600. Pharmacology is the science of drugs and medications, [ 1] including a substance's origin, composition, pharmacokinetics, pharmacodynamics, therapeutic use, and toxicology. More specifically, it is the study of the interactions that occur between a living organism and chemicals that affect normal or abnormal biochemical function. [ 2]
Pharmacognosy is the study of crude drugs obtained from medicinal plants, animals, fungi, and other natural sources. [ 1] The American Society of Pharmacognosy defines pharmacognosy as "the study of the physical, chemical, biochemical, and biological properties of drugs, drug substances, or potential drugs or drug substances of natural origin ...
Sample size determination or estimation is the act of choosing the number of observations or replicates to include in a statistical sample. The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample size used in a study is usually determined ...
An Evergreen Protective Association volunteer recording an oral history at Greater Rosemont History Day. Oral history is the collection and study of historical information about people, families, important events, or everyday life using audiotapes, videotapes, or transcriptions of planned interviews. These interviews are conducted with people ...
Classical Greek and Indian mathematicians made studies of the theory of rational numbers, as part of the general study of number theory. [19] The best known of these is Euclid's Elements, dating to roughly 300 BC. Of the Indian texts, the most relevant is the Sthananga Sutra, which also covers number theory as part of a general study of ...
Mathematics. Number theory (or arithmetic or higher arithmetic in older usage) is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic functions. German mathematician Carl Friedrich Gauss (1777–1855) said, "Mathematics is the queen of the sciences—and number theory is the queen of mathematics." [1]
Statistical significance. In statistical hypothesis testing, [1] [2] a result has statistical significance when a result at least as "extreme" would be very infrequent if the null hypothesis were true. [3] More precisely, a study's defined significance level, denoted by , is the probability of the study rejecting the null hypothesis, given that ...