A Z-Score chart, often called a Z-Table, is used to find the area under a normal curve, or bell curve, for a binomial distribution. The Z score itself is a statistical measurement of the number of standard variations from the mean of a normal distribution. The Z-score value can either positive or negative indicating that sample lies above or below…

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How to Make a Box and Whisker Plot Box and whisker plots are one of the ways that data can be shown visually. Most people are visual learners and having a way to analyze the data in a visual manner instead of as a list of numbers can be helpful and informative. Some of the vocabulary with box and whisker…

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How to Rationalize the Denominator Rationalizing the denominator is the process of moving any root or irrational number (cube roots or square roots) out of the bottom of the fraction (denominator) and to top of the fraction (numerator). The denominator is the bottom part of a fraction. This part of the fraction can not have any irrational numbers. The most common…

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How to Complete the Square in Algebra Completing the square, sometimes called x 2 x 2, is a method that is used in algebra to turn a quadratic equation from standard form, ax2 + bx + c, into vertex form, a(x-h)2 + k. The vertex form is an easy way to solve, or find the zeros of quadratic equations. It also helps to…

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