Unit 1 - Accessible Statistics - MAIN POST
American InterContinental University
Statistics is a field that collects and interprets quantitative data on any subject in order to describe traits of a state's population.
Body (4 paragraphs)
Two different methods of data collection are observational data and census.
Observational data is a process where the observer observes a given situation in order to record and collect the information observed. The observational data has been used in north Atlantic region to understand why extra tropical cyclones are the main reason of intra-annual climate variability. From 1957 to 2000, the observers registered green house gas concentration. Observers also recorded the life cycle of extra tropical cyclones. In addition, they emphasized on the level of the sea temperature surface in North Atlantic Ocean also called North Atlantic Oscillation (NAO). These observational data in this case allowed observers to interpret and explain why the number of intense cyclones increases now days (Sienz, Schneidereit, Blender, Fraedrich, 2010).
The pro of an observational data is that information is collected when and where an activity or event is taking place. The disadvantage is that the information collected by observational method cannot be generalized to a larger population.
Another data collection method is census. It is a method of collecting data by survey on an entire population at a point time. The US census bureau uses this to determine US population including sex, age, race, ethnicity and household. It was a formula that each household fielded and sent back to the bureau via mail (United States Census Bureau 2010, 2011)
The advantage of census is that there is a great chance to have feedback from the population. However, census is not practical in most study because it takes time and it cost. (Meradorf, 2009).
Observational data and census are two collection data method used in statistic. Observational data is applied on a small group while census needs a large population.
Meradorf, S. (2009). Advantages and disadvantages of census survey. Retrieved March, 23rd 2012, from http://survey.cvent.com/blog/cvent-web-surveys-blog/advantages-and-disadvantages-of-census-surveys
Sienz,F. , Schneidereit, A., Blender, R. , Fraedrich, K. (2010). Extreme value statistics for North Atlantic cyclones. Retrieved March, 23rd 2012, from http://ehis.ebscohost.com.proxy.cecybrary.com/ehost/pdfviewer/pdfviewer?vid=5&hid=115&sid=ecd1b325-27f2-49f2-9040-886e5ca78545%40sessionmgr12.
United States Census Bureau 2010. (2011). 2010 census data. Retrieved March, 23rd 2012, from http://2010.census.gov/2010census/data/