https://www.khanacademy.org/math/ap-statistics/analyzing-categorical-ap/xfb5d8e68:language-variation-variables/v/identifying-individuals-variables-and-categorical-variables-in-a-data-set 2024-05-31T20:09:46.930811028Z Identifying individuals, variables and categorical variables in a data set The concept of variables in data sets comes to life through an exploration of categorical and quantitative variables. Using nutritional data from a coffee shop as an example, the lesson highlights how variables can represent diverse aspects of a data set, such as drink type, calorie count, sugar content, and caffeine amount. video https://cdn.kastatic.org/googleusercontent/VoX1L5bEmGHX80BSI4lPLdERhFNGOhWwWM6N31m_DmMCQs0hxYYvHAS9XNbq2Rx2UWjx0_Ngj4HMQgbWYlWzU6A Identifying individuals, variables and categorical variables in a data set The concept of variables in data sets comes to life through an exploration of categorical and quantitative variables. Using nutritional data from a coffee shop as an example, the lesson highlights how variables can represent diverse aspects of a data set, such as drink type, calorie count, sugar content, and caffeine amount. https://cdn.kastatic.org/ka-youtube-converted/EqeVXI4WNHM.mp4/EqeVXI4WNHM.mp4 160 Designing and conducting experiments (methodology development) https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:intermolecular-forces-and-properties/x2eef969c74e0d802:solutions-and-mixtures/v/dilution 2022-10-05T02:43:18.611402953Z Dilution A common method of making a solution of a given concentration involves taking a more concentration solution and adding water until the desired concentration is reached. This process is known as dilution. We can relate the concentrations and volumes before and after a dilution using the following equation: M₁V₁ = M₂V₂ where M₁ and V₁ represent the molarity and volume of the initial concentrated solution and M₂ and V₂ represent the molarity and volume of the final diluted solution. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/1f247abd-d1b4-4ab2-a376-e4cf90204f21_1280_720_base.png Dilution A common method of making a solution of a given concentration involves taking a more concentration solution and adding water until the desired concentration is reached. This process is known as dilution. We can relate the concentrations and volumes before and after a dilution using the following equation: M₁V₁ = M₂V₂ where M₁ and V₁ represent the molarity and volume of the initial concentrated solution and M₂ and V₂ represent the molarity and volume of the final diluted solution. https://cdn.kastatic.org/ka-youtube-converted/T3H7YZ6-fto.mp4/T3H7YZ6-fto.mp4 353 Designing and conducting experiments (methodology development) https://www.khanacademy.org/science/biology/intro-to-biology/science-of-biology/a/experiments-and-observations 2022-11-17T02:07:40.773840513Z Controlled experiments How scientists conduct experiments and make observations to test hypotheses. article