how to do standard deviation
In the previous post we have discussed about Range in Math and In today's session we are going to discuss about how to do standard deviation. If we want to extent the deviation of data then standard deviation can be used to show the deviation of different data from its mean. It is equals to square root of variance. Basically standard deviation shows that how many data items are pointed top and below the mean. Let’s show that how to do standard deviation. The formula is also given to find the standard deviation from its mean value:
S = √∑(x – x’2)
N – 1
Here‘s’ denotes the standard deviation, ‘X’ denotes each value in the sample, X’ denotes the mean of the values, ‘N’ denotes the number of the values (the simple size). Now we will see how to do standard deviation. Some steps are givne to solve the standard deviation. (know more about standard deviation, here)
Step 1: To find the standard deviation first of all we have to find the mean of the given data’s.
Step 2: After doing so, we have to subtract the mean value from each value present in data set.
Step 3: Then we have to calculate the expected mean of values which we obtained in step 2.
Step 4: After then solve the square root of value we obtained from step 3, the value which we get is the standard deviation. Some identites are also defined for the standard deviation which are: For a constant variable ‘c’ the random variable ‘S’ and ‘T’ can be written as: Stdev (c) = 0,
Stdev (S + c) = stdev (S), and Stdev (cS) = | c | stdev (S), The word ‘std’ denotes the standard deviation. Then the relation between the standard deviation and covariance can be writeen as: Stdev (S + T) = √ var (S) + var (T) +2 cov (S, T), Where var = stdev2 and cov stands for the variance and covariance respectively. Simple Linear Regression is a used to fit a given strainght line using the set of n points. cbse sample papers 12 is help us in the examination hall.