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October 5, 2015 at 10:12 am
Firstly, I would like to say thanks for your useful lecture.
In my opinion, stratified sampling is same as quota sampling as both of them require knowledge of the proportion of the population, and with stratified sampling we also need a specific sample to examine (say 200 people) and now it is same as quota sampling (question in the sample of 200 with 60% women and 40% men).
I also have another question about systematic. I think systematic is also impossible as random sampling as we are almost unable to mark number to all items to know which of them is 8th and which are every 10th (unless they are already numbered).
Sorry if I miss some things in the lecture that are related to my questions as I cannot hear what the teacher said clearly. Thanks again !
John Moffat says
October 5, 2015 at 10:41 am
Stratified and quota are similar, but not the same.
With stratified having decided how many to select you select at random from each group.
With quota you ask (in the example in the notes) the first 120 women and then no more women – they are not selected at random.
Systematic sampling is not random. The only truly random sampling is where every item has an equal chance of being selected..
October 5, 2015 at 3:10 pm
Thanks for your kind reply!
August 1, 2015 at 9:18 am
I sat two paper FFM and FAU but couldn’t pass FAU while i thought i did well.
Help me to know the strategy to pass FAU as i plan december 15
April 1, 2015 at 3:23 pm
Thank you very much for the lessons very helpful.
I am still not quite clear the difference between Stratified and Multistage sampling, as in both you need to divide or split in group. However, it looks to me that if the question mention the word “proportion” or “percentage” it will be definitely Stratified. Am I correct?
Thank you in advance for your help.
June 9, 2015 at 1:00 am
As the professor said in the lesson that Stratified sampling focuses on category while Multistage sampling focuses more on groups. e.g. Man or Woman(it’s a category); a big group divided into small groups (it’s not specifically concerning about men or women, they can both in those groups)
and..yes, “proportion” and “percentage” can be a distinction between these two sampling methods.
Farzana sultana says
February 9, 2015 at 11:45 pm
it is really helpful. i m gonna sit for the exam on 17th.last time i could not pass as i only read the study book n tried the practice kit may b.only yesterday i found ur opentution website.n now i m able to understand many things which i did assume first time.i m happy to have this lectures. is there any suggestion for me to pass in the exam as i hv very little time.
February 10, 2015 at 8:38 pm
all the best sister….pray for me too.
February 10, 2015 at 9:39 pm
hv u passed the exam already?
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