https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:working-units/x2f8bb11595b61c86:appropriate-units/v/reporting-measurements 2022-09-10T01:04:29.754011735Z Reporting measurements We should think about the appropriate level of precision of different measurements in modeling problems. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/ddffe2ca-21c3-4088-8f4f-50f2d43168f2_1280_720_base.png Reporting measurements We should think about the appropriate level of precision of different measurements in modeling problems. https://cdn.kastatic.org/ka-youtube-converted/UEe81kJtY8A.mp4/UEe81kJtY8A.mp4 363 Planning and designing investigations https://www.khanacademy.org/science/biology/intro-to-biology/science-of-biology/a/the-science-of-biology 2021-04-29T07:51:28Z The scientific method How the scientific method is used to test a hypothesis. article https://www.khanacademy.org/math/ap-statistics/gathering-data-ap/statistics-experiments/e/experiment-designs 2021-07-01T17:39:48Z Experiment designs Practice identifying which experiment design was used in a study: completely randomized, randomized block, or matched pairs. Charlotte Auen exercise https://www.khanacademy.org/math/statistics-probability/designing-studies/types-studies-experimental-observational/a/observational-studies-and-experiments 2021-04-29T07:58:33Z Observational studies and experiments article https://www.khanacademy.org/math/ap-statistics/gathering-data-ap/statistics-experiments/v/intro-experiment-design 2021-07-01T17:39:48Z Introduction to experiment design Explanatory and response variables. Random sampling and random assignment (including block design). Placebos and blind/double-blind experiments. video https://cdn.kastatic.org/googleusercontent/FWlY82Ar6qpXCZooFU10dDE4SqdHoGjwPRC4gqnW-m9sW2_bbyDBec32CnPQ3VpLUxUZiL8bBZCbECAfVDpt3EU Introduction to experiment design Explanatory and response variables. Random sampling and random assignment (including block design). Placebos and blind/double-blind experiments. https://cdn.kastatic.org/ka-youtube-converted/Fw8qsuZNzH4.mp4/Fw8qsuZNzH4.mp4 400 Planning and designing investigations https://www.khanacademy.org/math/ap-statistics/gathering-data-ap/statistics-experiments/a/principles-of-experiment-design 2021-07-01T17:39:49Z Principles of experiment design article https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:what-is-science/v/science-process-skills 2025-08-03T13:25:59.852202938Z Science process skills Ever wonder how scientists explore the world? In this video, we'll dive into science process skills—powerful thinking tools you use whenever you speak, listen, read, write, or think! Learn how these skills can help you answer questions, conduct experiments, and investigate your everyday surroundings. Whether you're curious about nature, solving puzzles, or just asking “why?”, mastering these skills will unlock your inner scientist. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Science process skills Ever wonder how scientists explore the world? In this video, we'll dive into science process skills—powerful thinking tools you use whenever you speak, listen, read, write, or think! Learn how these skills can help you answer questions, conduct experiments, and investigate your everyday surroundings. Whether you're curious about nature, solving puzzles, or just asking “why?”, mastering these skills will unlock your inner scientist. https://cdn.kastatic.org/ka-youtube-converted/KWOIfA8P4Sg.mp4/KWOIfA8P4Sg.mp4 531 Planning and designing investigations https://www.khanacademy.org/math/ap-statistics/gathering-data-ap/statistics-experiments/v/matched-pairs-experiment-design 2024-01-19T18:11:00.175514848Z Matched pairs experiment design The video presents an in-depth exploration of experimental design in statistics, focusing on the use of control and treatment groups, block design, and matched pairs design. It emphasizes the importance of random assignment to mitigate lurking variables and bias, and the value of double-blind experiments. The video also discusses the potential for imbalance in experimental groups and how matched pairs design can help address this issue. video https://cdn.kastatic.org/googleusercontent/PoADK1wKuTJ8qsh9JiuG0ocXieDi5FkXJ3eWgkG76UCWa5talQBPHDo-HsjcVDirJqPuImhtrcS6rzHgBfM-yZgwTw Matched pairs experiment design The video presents an in-depth exploration of experimental design in statistics, focusing on the use of control and treatment groups, block design, and matched pairs design. It emphasizes the importance of random assignment to mitigate lurking variables and bias, and the value of double-blind experiments. The video also discusses the potential for imbalance in experimental groups and how matched pairs design can help address this issue. https://cdn.kastatic.org/ka-youtube-converted/UEFBGewP2ik.mp4/UEFBGewP2ik.mp4 337 Planning and designing investigations https://www.khanacademy.org/science/biology/intro-to-biology/science-of-biology/v/the-scientific-method 2023-09-24T07:18:20.902045194Z The scientific method The scientific method is a logical approach to understanding the world. It starts with an observation, followed by a question. A testable explanation or hypothesis is then created. An experiment is designed to test the hypothesis, and based on the results, the hypothesis is refined. This process is repeated, leading to a deeper understanding of the observed phenomenon. This method ensures our knowledge is built on a solid foundation. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZNIs_jJJ4FC9r76opQp-voduNhewR1yg7uVXDBEM_Y24hZBA8y49h1pO5UogWhkhcIZ8d3xL2ZkdCfOHgPdPtws The scientific method The scientific method is a logical approach to understanding the world. It starts with an observation, followed by a question. A testable explanation or hypothesis is then created. An experiment is designed to test the hypothesis, and based on the results, the hypothesis is refined. This process is repeated, leading to a deeper understanding of the observed phenomenon. This method ensures our knowledge is built on a solid foundation. https://cdn.kastatic.org/ka-youtube-converted/N6IAzlugWw0.mp4/N6IAzlugWw0.mp4 709 Planning and designing investigations https://www.khanacademy.org/math/ap-statistics/gathering-data-ap/statistics-experiments/a/the-language-of-experiments 2021-07-01T17:39:51Z The language of experiments article 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 https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-equations-and-inequalities/cc-6th-dependent-independent/v/dependent-independent-variables 2022-10-06T10:51:19.744279358Z Dependent & independent variables We introduce independent and dependent variables: how to identify the independent/dependent variable in a given setting, and how we write equations with the dependent variable by itself. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/4f46a228-37d6-438e-b8f8-9064a8043aa3_1280_720_base.png Dependent & independent variables We introduce independent and dependent variables: how to identify the independent/dependent variable in a given setting, and how we write equations with the dependent variable by itself. https://cdn.kastatic.org/ka-youtube-converted/SGC_d7O7_Eg.mp4/SGC_d7O7_Eg.mp4 139 Planning and designing investigations https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-equations-and-inequalities/cc-6th-dependent-independent/e/dependent-and-independent-variables 2026-04-08T01:15:04.085520103Z Independent versus dependent variables Practice figuring out if a variable is dependent or independent. Christopher Wobbles Seymour exercise 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 Planning and designing investigations