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2. Inverse-square law - Wikipedia

   en.wikipedia.org/wiki/Inverse-square_law

   For quick approximations, it is enough to remember that doubling the distance reduces illumination to one quarter; [9] or similarly, to halve the illumination increase the distance by a factor of 1.4 (the square root of 2), and to double illumination, reduce the distance to 0.7 (square root of 1/2). When the illuminant is not a point source ...

3. 68–95–99.7 rule - Wikipedia

   en.wikipedia.org/wiki/68–95–99.7_rule

   In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.

4. Coefficient of determination - Wikipedia

   en.wikipedia.org/wiki/Coefficient_of_determination

   When only an intercept is included, then r 2 is simply the square of the sample correlation coefficient (i.e., r) between the observed outcomes and the observed predictor values. [4] If additional regressors are included, R 2 is the square of the coefficient of multiple correlation. In both such cases, the coefficient of determination normally ...

5. RFK Jr. grilled again about his move to California while ...

   www.aol.com/news/rfk-jr-grilled-again-moving...

   Robert F. Kennedy Jr. insisted he plans to return to live in New York, as the independent presidential candidate was grilled for a second day Wednesday about his residency and whether he should be ...

6. Mean squared error - Wikipedia

   en.wikipedia.org/wiki/Mean_squared_error

   The MSE either assesses the quality of a predictor (i.e., a function mapping arbitrary inputs to a sample of values of some random variable), or of an estimator (i.e., a mathematical function mapping a sample of data to an estimate of a parameter of the population from which the data is sampled).

7. Pro-Trump super PAC says it will spend $100 million on ads ...

   www.aol.com/pro-trump-super-pac-says-212305799.html

   A super PAC aligned with former President Donald Trump’s campaign says it’s planning on spending $100 million in ads between now and Labor Day as Trump looks to recapture momentum that has ...