1. Profile photo of Pamela says

    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.

    • Profile photo of Sam says

      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.

  2. Profile photo of Farzana sultana says

    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.

    • Profile photo of John Moffat says

      If it is Kaplan then certainly it is OK :-)

      But most important is the Exam Kit. If you watch and understand our free lectures then you do not need the Study Text so much.
      However what you do need is lots of practice – the Exam Kit contains lots of exam-standard questions to practice on.

  3. avatar says

    Are the test questions in the video around 30:23 the same as the ones in the course notes or different? Are they there or am I looking in the wrong place. The questions on page 7(mentioned in the lecture) are not the same as the ones in the notes.

    • Profile photo of John Moffat says

      Primary or secondary depends on why the data was collected (not who is using it).

      So, with the census various information is published. For example, it might give the proportions of the population within different age groups. Because the data was collected specifically to give this information (by there being a question on the census form) it is primary.
      Secondary is when the data was collected for some other reason and then used for a different reason.

    • avatar says

      Primary data in simple terms is unused or processed data
      whereas secondary data been data already used for a different purpose which you are not going to rely on for on to perform a task

    • Profile photo of John Moffat says

      No – the answer is C.

      The question is a little silly to be honest, but the reason is that (i) and (iii) are calculated using data that was collected for another purpose.
      (ii) and (iv) we are using data that exists specifically for a purpose.

      • Profile photo of MikeLittle says

        @mursaleen25, It’s not always. If you have only 50 customers and you invoice them all once per month, you’re only going to be looking at the same 5 customer accounts in your sample. That’s hardly random. The only thing truly random about systematic sampling is the random start point – ie the first item selected from the population

  4. Profile photo of eloacca says

    question 1 page 7 is not very clear to me tho.i need more examples to be able to distinguish between primary and secondary data.every other topic was well understood thank you

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