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New videos from Khan Academy 2018-04-25T00:22:28.098400
Updated: 2 hours 37 min ago

Conditions for inference on slope

8 hours 10 min ago
Introducing the conditions for making a confidence interval or doing a test about slope in least-squares regression.

Introduction to inference about slope in linear regression

Tue, 2018-04-24 23:18
Introduction to sample slopes and using them to make confidence intervals or do a test about the population slope in least-squares regression

Using a confidence interval to test slope

Tue, 2018-04-24 20:05
Using confidence interval for hypothesis test on regression slope

Using a P-value to make conclusions in a test about slope

Mon, 2018-04-23 17:53
Making conclusions in a hypothesis test about the slope of a least-squares regression line.

Law of conservation of energy

Sat, 2018-04-21 01:29
Sal discusses how energy can't be created or destroyed in an isolated system, and works an example of how energy is transformed when a ball falls toward the Earth.

Energy graphs for simple harmonic motion

Sat, 2018-04-21 01:29
Sal graphs elastic potential energy and kinetic energy for a mass on a spring and compares the total energy when with and without dissipative forces (friction).

Free body diagram with angled forces: worked example

Sat, 2018-04-21 01:20
Sal draws a free body diagram for a box held stationary against a wall with a force at an angle theta.

Breaking down forces for free body diagrams

Sat, 2018-04-21 01:20
Sal explains how to draw free body diagrams when forces are applied at an angle. How to find horizontal and vertical components of an angled force using trigonometry.

Types of forces and free body diagrams

Sat, 2018-04-21 01:20
Sal defines and compares tension, weight, friction and normal forces using free body diagrams.

Understanding economic growth

Fri, 2018-04-20 22:47
In this video, learn about the definition of economic growth and how growth occurs. AP(R) Macroeconomics on Khan Academy: Macroeconomics is all about how an entire nation’s performance is determined and improved over time. Learn how factors like unemployment, inflation, interest rates, economic growth and recession are caused and how they affect individuals and society as a whole. We hit the traditional topics from an AP Macroeconomics course, including basic economic concepts, economic indicators, and the business cycle, national income and price determination, the financial sector, the long-run consequences of stabilization policies, and international trade and finance. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything

Calculating t statistic for slope of regression line

Fri, 2018-04-20 22:28
Calculate the test statistic in a test about the slope of a regression line

Current through resistor in parallel: Worked example

Fri, 2018-04-20 21:52
How to calculate the current through a resistor in parallel using equivalent resistance and Ohm's law.

Current due to closing a switch: worked example

Fri, 2018-04-20 21:52
Find the current due to closing a switch using equivalent resistance and Ohm's law.

Brown v. Board of Education of Topeka

Thu, 2018-04-19 21:55
Brown v. Board was a Supreme Court case decided in 1954. It ended the doctrine of "separate but equal", and brought an end to racial segregation in schools. In this video, Kim discusses the case with scholars Theodore Shaw and Michael McConnell. To learn more about US Government and Politics, visit Khan Academy at To read more about constitutional law, visit the National Constitution Center’s website: On this site, leading scholars interact and explore the Constitution and its history. For each provision of the Constitution, experts from different political perspectives coauthor interpretive explanations when they agree and write separately when their opinions diverge.

Confidence interval for the slope of a regression line

Thu, 2018-04-19 18:21
Confidence interval for the slope of a regression line

Gravitational potential energy at large distances

Wed, 2018-04-18 21:33
Learn how to calculate gravitational potential energy when we can no longer assume the gravitational field is uniform.

Conservation of angular momentum

Wed, 2018-04-18 21:33
How angular momentum is conserved within a system when there is no external torque.

What I do and how much I make

Tue, 2018-04-17 22:39
Teresa explains her responsibilities as a community liaison for Colorado Choice Transitions and why she is passionate about this work.

My budget and planning for the future

Tue, 2018-04-17 22:39
Teresa talks about the importance of working in a career that supports her quality of life and how she budgets to cover emergency expenses.

How I got my job and where I'm going

Tue, 2018-04-17 22:39
Teresa talks about the importance of mentors, her path into public health, and opportunities for advancement in her field.


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