From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to calculate a confidence interval in basic statistics.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Solve a system of equations with the comparison method

How To: Calculate Faster Than a Calculator

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Find the equation of a tangent line

How To: Do long division without a calculator

How To: Find a number given Its percent

How To: Find the Percent Given Two Numbers

How To: Rationalize square roots

How To: Find the vertical asymptotes of a rational function

How To: Solve rational expression simplification word problems

How To: Solve word problems involving the addition of whole numbers

How To: Convert Fahrenheit to Celsius with a formula

How To: Subtract a mixed number from a proper fraction in basic math

How To: Convert between diameter and radius

How To: Find the area of a triangle when given 2 sides & angle

How To: Find a missing coordinate given: coordinate & equation

How To: Find the slope of a line given 2 points with fractions

How To: Evaluate square roots

How To: Find the 100th term in a sequence
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