Simple random sampling - sampling decisions, Operation Research

Assignment Help:

Simple Random Sampling 

This  is  simplest  and most  popular  technique  of sampling. In it each  unit  of the  population has equal  chance  of being  included in the sample. This  method impels  that if  N is  the size of  the population  and n units are to  be drawn in   the sample  then the sample  should be  taken in such  a way  that each  of the N Cn sample  has an equal chance  of being selected.

Simple random  sampling  gives

a. Each  element  in the  population an equal  chance  of being  included in the  sample and all  choices are independent of  each other.

b. Each possible combination an equal  chance of being  chosen.

The  method of simple  random sampling  eliminates the chance  of bias or personal  prejudices in the  selection of units. Some of the common  method of drawing  simple  random samples  are (a) lottery method (b) Random Sampling number.

  Lottery Methods : The followings  are the  steps in this  methods. Let  N be the  size of  population  and a sample  of size n is to be drawn.

  • Number the units of the population from 1 to 2.
  • Take N identical pieces of papers cards capsules or balls and number these from 1 to N.
  • Mix these thoroughly in a bag bowl or some other container and pick out n items either one by one or in one stroke blind folded.
  • The number of units in the population bearing the numbers on the items drawn in step will constitute the desired random sample.

 

By Using  Random Number A number of people viz.... . L. H. C. Tippet  fisher  and Yates Kendall and smith Oliver and Boyd and rand corporation  constructed set of  random number. These  numbers can be sued to select random  samples from a given population. A table of true random numbers is one in which  any digit from 0 to 9  have an  equal chance of appearing  in any  position of the table. Random numbers are most useful when  population is of infinite size. The digits  in random  number tables  are selected at random and are  arranged independently of digits occupying  other  places in  a number. The  random  number table  prepared by L.H. C. Tippet  contains a set of 10400 four  figure  numbers.

Advantages of Simple Random Sampling :

a. The method  is objective .

b.The conclusions  can be  derived in terms  of probability or errors  of estimation.

c. Accurate  mathematical  tests  may be  applied  to judge  the  randomness  of the sampling .

 

 


Related Discussions:- Simple random sampling - sampling decisions

Table of contents - report writing presentation, Table of contents ...

Table of contents The tables  of contents  is an outline  of the order  of the chapters sections and  sub  section  with their  respective  pages. If  report  includes  a n

Simulation models - operation research model, These models are used to dev...

These models are used to develop a method to evaluate the merit of alternative courses or action by representing with a mathematical model of the problems where various variab

MODERN MANAGEMENT, DISCUSS THE SIGNIFICANCE AND SCOPE OF OPERATION RESEARCH...

DISCUSS THE SIGNIFICANCE AND SCOPE OF OPERATION RESEARCH IN MODERN MANAGEMENT

Sampling techniques, discuss and explain both probability and non probabili...

discuss and explain both probability and non probability sampling techniques.

Pamphlets and Patents - classification of documents, Pamphlets - classifica...

Pamphlets - classification of documents: A pamphlet is an independent publication. It is normally a document of a few printed pages, usually less than 49. Pamphlets cover an e

Linear programmimg, #questionA paper mill produces two grades of paper viz....

#questionA paper mill produces two grades of paper viz., X and Y. Because of raw material restrictions, it cannot produce more than 400 tons of grade X paper and 300 tons of grad

Post-optimal analysis, It can be seen from the optimal solution for the fou...

It can be seen from the optimal solution for the foundry problem that two resources, raw material-1 and labor, are exhausted whereas the other two resources, raw materi

Linear problem, #q A paper mill produces two grades of paper viz., X and Y....

#q A paper mill produces two grades of paper viz., X and Y. Because of raw material restrictions, it cannot produce more than 400 tons of grade X paper and 300 tons of grade Y pape

Meaning of research report - report writing presentation, Meaning of Resear...

Meaning of Research Report Research  report is the process of communicating  the  results  of an investigation it  is a document which  reflect about  the research conducted a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd