Discrete Standard Deviation

For calculating standard deviation in discrete series any of the following methods may be applied

(1) Actual mean method.

(2) Assumed mean method.

(3) Step deviation method.

(a) Actual mean methods when this method is applied deviations are taken from the actual mea we find (X-X) and denote these deviations by x. These deviations are then squared and multiplied by the respective frequencies. The following formula is applied:

s = v S fx2 /N where x = (X – X)

However in practice this method is rarely used because if the actual mean is in fractions the calculations take a lot of time.

(b) Assumed mean method when this method is used the following for mule is applied

S = v {fd2 / N – ({ fd/N)2 where d = (x – A)

Steps

Take the deviations of the items form an assumed mean and denote there deviation by d.

Multiply these deviations by the respective frequencies and obtain the total { fd.

Obtain the squares of the deviations calculate d2. Multiply the squared deviations by the respective frequencies an obtain the total {fd2.

Substitute the value in the above formula

Posted Date: 1/31/2012 11:42:50 PM | Location : United States

Ask an Expert

Related Discussions:- Discrete Standard Deviation, Statistics, Assignment Help, Ask Question on Discrete Standard Deviation, Statistics, Get Answer, Expert's Help, Discrete Standard Deviation, Statistics Discussions

Write discussion on Discrete Standard Deviation, Statistics
Your posts are moderated

Write your message here..

Related Questions

Trial balance, paid installation charges of machinery rs1100 paid installation charges of machinery rs1100

Cost , For the month of June, Department A of Pauley Inc. had a segment mar... For the month of June, Department A of Pauley Inc. had a segment margin ratio of 15%, a variable expense ratio of 60% of sales, and traceable fixed expenses of $15,000. Department

Business statistics, importance of statistics importance of statistics

Explain correlation coefficients, 1. What type of correlation coefficient w... 1. What type of correlation coefficient would you use to examine the relationship between the following variables? Explain why you have selected the correlation coefficients. A.

Explanation of the statistical analyses, Introduction Background inform... Introduction Background information so the reader can better grasp the analyses you are going to present. This can include anything that puts the analyses into perspective for

Calculate and interpret, U.S. College presidents have described alcohol abu... U.S. College presidents have described alcohol abuse as the number one problem on campus.  How common is it?  As a super crackerjack student, you conducted a survey of 17,096 stude

Frequcency, how can we construct a bivariate frequency distribution how can we construct a bivariate frequency distribution

Determine the mean and standard deviation, 1.)  Two dice are rolled and the... 1.)  Two dice are rolled and the sum is calculated.  Let X represent the sum of the two dice. Construct a probability distribution expressing probabilities in fractional form. 2

#binomial probability, they gave me n=30 and p=.23 to get the answers for P... they gave me n=30 and p=.23 to get the answers for P(20,x,23)= and P(x.23)=

Quota sampling, Quota Sampling: in stratified the cost of taking random sam... Quota Sampling: in stratified the cost of taking random samples from individual strata is often so expensive that interviewers are simply give quota to be filled from different str