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Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [ 4 ] As of December 2021, Quizlet has over 500 million user-generated flashcard sets and more than 60 million active users.
Bennett's inequality, an upper bound on the probability that the sum of independent random variables deviates from its expected value by more than any specified amount Bhatia–Davis inequality , an upper bound on the variance of any bounded probability distribution
Such inequalities are of importance in several fields, including communication complexity (e.g., in proofs of the gap Hamming problem [13]) and graph theory. [14] An interesting anti-concentration inequality for weighted sums of independent Rademacher random variables can be obtained using the Paley–Zygmund and the Khintchine inequalities. [15]
Economic inequality is an umbrella term for a) income inequality or distribution of income (how the total sum of money paid to people is distributed among them), b) wealth inequality or distribution of wealth (how the total sum of wealth owned by people is distributed among the owners), and c) consumption inequality (how the total sum of money spent by people is distributed among the spenders).
Income inequality has fluctuated considerably since measurements began around 1915, declining between peaks in the 1920s and 2007 (CBO data [2]) or 2012 (Piketty, Saez, Zucman data [15]). Inequality steadily increased from around 1979 to 2007, with a small reduction through 2016, [2] [16] [17] followed by an increase from 2016 to 2018. [18]
Educational Inequality is the unequal distribution of academic resources, including but not limited to school funding, qualified and experienced teachers, books, physical facilities and technologies, to socially excluded communities. These communities tend to be historically disadvantaged and oppressed.
When comparing average math test scores of boys and girls in kindergarten, they did not discover an average gender gap. However, when looking at data from students in second or third grade, the researchers discovered that boys perform better on the math tests (by a standard deviation of 0.25 average gender gap). [96]
Poor health outcomes appear to be an effect of economic inequality across a population. Nations and regions with greater economic inequality show poorer outcomes in life expectancy, [31]: Figure 1.1 mental health, [31]: Figure 5.1 drug abuse, [31]: Figure 5.3 obesity, [31]: Figure 7.1 educational performance, teenage birthrates, and ill health due to violence.