Lawrence Perez, from Saddleback College, and his assistant Charlie, give this introduction to statistics lesson on using the Z tests for the mean. If you don't know about statistics, well, I don't know what to say.
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How To: Use ">" (greater than) and "<" (less than) symbols

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

How To: Calculate percent composition for chemistry

How To: Find a number given Its percent

How To: Find standard deviation

How To: Convert Fahrenheit to Celsius with a formula

How To: Convert fractions to percents in two steps

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Identify characteristics of a sample during a survey

How To: Find the Slope Given 2 Ordered Pairs

How To: Use a TI89 to calculate nCr

How To: Find the equation of a circle given: center & tangent

How To: Find the area of an oblique triangle using formulas

How To: Write a slopeintercept equation given an XY table

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

How To: Find the area of rectangles, triangles & rectangles

How To: Calculate the area of complex shapes

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

How To: Evaluate exponents

How To: Find the surface area of a cylinder easily
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