How we change what others think, feel, believe and do 
Simple random sampling
Explanations > Social Research > Sampling > Simple random sampling Use  Method  Example  Discussion  See also
UseUse in simple experiments that require a single sample to be taken from a given population or a representative sample frame. The people in the sample frame must all be accessible and available. Use when the target group is sufficiently large. Do not use when the target is a relatively small subgroup that might be missed by this method. MethodCreate the sample by selecting randomly from the sample frame or population. This can be done using a paper list of random numbers, although these days a computer is often used. ExampleA person researching education levels within a company takes the full employee list and applies a random number algorithm to this in order to select people to interview. DiscussionThe basic principle of simple random sampling is like drawing names out of a hat and is based on the mathematical property that a truly random sample (if big enough) will be representative of the target population. The simple random sample has two key properties:
Random number generation is easy these days with a computer where, for example the Excel '=RAND()' function (just type it into any cell) generates a random number between 0 and 1. To generate a number between 0 and 5, multiply this by five and take the integer to round it down (eg. '=INT(5*RAND()'). A problem with random selection is that this is not always possible. For example to do a true random sample of the population of the USA, you would start with a list of everyone there, then select a random sample from this (very big) list, then access those people selected, no matter where they lived and whether or not they wanted to partake in the study. See also

Site Menu 
 Home  Top  Quick Links  Settings  
Main sections:  Disciplines  Techniques  Principles  Explanations  Theories  
Other sections:  Blog!  Quotes  Guest articles  Analysis  Books  Help  
More pages:  Contact  Caveat  About  Students  Webmasters  Awards  Guestbook  Feedback  Sitemap  Changes  
Settings:  Computer layout  Mobile layout  Small font  Medium font  Large font  Translate  
You can buy books here 
And the big 
 Home  Top  Menu  Quick Links  
© Changing Works 20022016 