Showing posts with label Mean Calculator. Show all posts
Showing posts with label Mean Calculator. Show all posts

Wednesday, December 12, 2012

Standard Deviation of the Mean Calculator

Introduction to standard deviation mean calculator

The standard deviation, also called the residual standard error, of a statistical population, a data set, or a probability distribution is the square root of its variance. Standard deviation is a widely used to measure of the variability or dispersion, being algebraically more tractable though practically less robust than the expected deviation or average absolute deviation..

There are other statistical measures that can use samples that some people confuse with averages - including 'median' and 'mode'. Other simple form of statistical analyses use measures of spread, such as range, inter quartile range, or standard deviation.

Finding Mean Deviation through Calculator:

The followings are the steps to be followed in the mean deviation calculator.

Step 1:

To find the arithmetic mean.

Sum of the given values
Mean =    ----------------------------------------
Total number of values
Step 2:

To find the deviation.

Deviation = mean – given values.

Step 3:

To find the absolute deviation.

Step 4:

To find the sum of the absolute deviation.

Step 5:

To find the mean deviation.

Sum of absolute deviation
=      -----------------------------------------
Total number

Problem on Standard Deviation and Mean

Calculate the sample mean and standard deviation for the given data set.

435 , 235 ,543 , 435, 230

Solution:

Mean: Calculate the sample mean for that the  given set of data.

`sum` (x)
x¯    =____________
n


435 + 235 + 543 + 435 + 230
= __________________________
5


=  1878/5

=375.6

Calculate the sample mean and the standard deviation by the formula.

`sqrt(sum ( x - x))`
s = _________________________
n - 1



`sqrt((435 - 375.6)2 +( 235 - 375.6)2 + (543 - 375.6)2 +( 435 - 375.6)2 + ( 230 - 375.6)2)`

s=     ___________________________________________________________________________________
5 - 1




`sqrt(76044.2.)`
s = ___________
4


s =  `sqrt(19011.05)`

s =   137.8805

The required deviation calcu;ator is 137.8805



Understanding how to make a histogram is always challenging for me but thanks to all math help websites to help me out.

Practice Problem in Standard Deviation Mean Calculator.

Q1:Here the  given   capacity are  44, 45, 44, 48, 47 and 47 and Find the Mean, Median, Mode, Variance, Standard Deviation, Standard Deviation Standard Error.

Mean:    = 46

Standard Deviation,S = 1.67332005