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: Remember "greater than" & "less than" symbols

How To: Figure out the domain & range of a piecewise function

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Do long division without a calculator

How To: Find the Slope Given 2 Ordered Pairs

How To: Convert improper fractions to mixed numbers quickly

How To: Find the area of a parallelogram using geometry

How To: Solve for the missing ratios or proportions

How To: Convert between diameter and radius

How To: Find the slope from a set of points

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Find the area & perimeter of triangles & squares

How To: Find a missing side of a triangle, similar to another

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

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

How To: Factor a trinomial with negative leading coefficient

How To: Subtract fractions with borrowing

How To: Find the area of a circle when you know the diameter
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