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What are deviations?

Mario Banuelos, PhD
Associate Professor of Mathematics
Mario Banuelos is an Associate Professor of Mathematics at California State University, Fresno. With over eight years of teaching experience, Mario specializes in mathematical biology, optimization, statistical models for genome evolution, and data science. Mario holds a BA in Mathematics from California State University, Fresno, and a Ph.D. in Applied Mathematics from the University of California, Merced. Mario has taught at both the high school and collegiate levels.

Mario Banuelos, PhD

Associate Professor of Mathematics

Expert Answer

A deviation is the distance of an observation or a data point from the mean, or the center of all the data points. it gives you a sense of how spread apart the data is from the mean.

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What is the easiest way to find variance?

Mario Banuelos, PhD
Associate Professor of Mathematics
Mario Banuelos is an Associate Professor of Mathematics at California State University, Fresno. With over eight years of teaching experience, Mario specializes in mathematical biology, optimization, statistical models for genome evolution, and data science. Mario holds a BA in Mathematics from California State University, Fresno, and a Ph.D. in Applied Mathematics from the University of California, Merced. Mario has taught at both the high school and collegiate levels.

Mario Banuelos, PhD

Associate Professor of Mathematics

Expert Answer

First, calculate the mean or average of all of the data points. Then, calculate the difference between each data point and that mean. Square each of those differences, add them all up, then divide them by n (the total number of data points) minus 1.

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Question

How do I calculate the variance of four numbers?

Community Answer

Follow these steps: Work out the mean (the simple average of the numbers.) Then, for each number, subtract the mean and square the result (the squared difference). Finally, work out the average of those squared differences.

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Question

If the coefficient of variance is 16 and mean is 25, how do I find the variance?

Community Answer

Coefficience of variance = (std dev / mean) * 100. 16 = (std dev / 25) * 100. Std dev = 4. Variance = (std dev)^2 = 16.

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How do I calculate the standard deviation?

Community Answer

Standard deviation is the square root of the variance.

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What is a coefficient of variance?

Community Answer

Coefficient of variance is ratio of standard deviation to mean. CV% = SD/mean * 100.

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Question

If the standard deviation is 4, the variance is what?

Community Answer

16. The square of 4 is 16, and the variance is the square of the standard deviation.

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What does it mean by inter quartile range?

Community Answer

This is the difference between the upper quartile and the lower quartile.

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How do I find the variance of a large number?

Community Answer

If you have a lot of figures, the best way to find the variance is too use excel. Therefore, you might as well look directly for the standard deviation as the variance's only use is too calculate standard deviation.

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How do I improve my math skills?

Community Answer

Try the methods in Improve Math Skills .

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How do I calculate population variance?

Community Answer

First find mean for population, then subtract mean from each value squared divide answer by number of variable in a population.

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How do I calculate the variance of a frequency distribution table?

Community Answer

Method 1 above shows you what to do. Namely: 1. Calculating the sample mean, 2. Subtract the sample mean to each number you are given, 3. Square each result, 4. Add all the values, 5. Divide it by the sample mean minus 1.

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How do I calculate variance for grouped data?

Community Answer

Find the midpoint of the class first and then use that as your x value for step two.

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Question

How do you describe standard deviation?

Donagan

Top Answerer

It's a measure of how much a set of numbers varies from the average number in the set.

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