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lgbasallote Group Title

"All the names of a class were written on separate tickets. Ten tickets were selected after the names were jumbled inside a can...." This is an example of simple random sampling right?

  • one year ago
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  1. charlotte123 Group Title
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    Yes I believe so :D Since its random ;D

    • one year ago
  2. lgbasallote Group Title
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    well...i know it's random....i just don't know the specific type of random sampling

    • one year ago
  3. charlotte123 Group Title
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    Isnt there only one type? :O do u have choices lol? :P

    • one year ago
  4. lgbasallote Group Title
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    it could be clustered random sampling....since they were grouped first... or maybe stratified random sampling since i don't know what it means....

    • one year ago
  5. lgbasallote Group Title
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    no there isn't one type and no choices

    • one year ago
  6. KingGeorge Group Title
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    I would probably argue that they're looking for clustered random sampling. They first divided some population up into "classes" and from this particular class, they made a simple random sampling. I see how this is confusing though. Since a clustered random sampling by definition has a simple random sampling in it...

    • one year ago
  7. vf321 Group Title
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    Taking AP Stats, eh @Igbasallote? It's SRS.

    • one year ago
  8. lgbasallote Group Title
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    clustered random sampling has something to do with grouping right @KingGeorge ?

    • one year ago
  9. lgbasallote Group Title
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    @vf321 not taking it....it's complicated anyway why SRS?

    • one year ago
  10. vf321 Group Title
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    One sec let me take my notes out with precise definitions.

    • one year ago
  11. KingGeorge Group Title
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    clustered random sampling is when you split the population into multiple groups/clusters, and then take a simple random sample. By saying this was from a "class" it implied to me that they had divided the overall population into multiple "classes"/groups.

    • one year ago
  12. lgbasallote Group Title
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    yes. my thoughts too

    • one year ago
  13. KingGeorge Group Title
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    It's that fact that confuses the question a little for me. Since any example of clustered random sampling is an example of simple random sampling as well.

    • one year ago
  14. lgbasallote Group Title
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    a lottery is a simple random sampling though...

    • one year ago
  15. vf321 Group Title
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    Def 1. SRS is a sample selected from a population that ensures that EVERY possible sample of desired size has the same chance of being selected (i.e., random number generator - but, the College Board counts the shuffled names on tickets as random) Def 2. A population can be divided into non-overlapping subgroups called clusters which are internally heterogenous. Random selection of several clusters and then assessment of all internal individuals is cluster sampling.

    • one year ago
  16. lgbasallote Group Title
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    ...so how is it not cluster nor random?

    • one year ago
  17. vf321 Group Title
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    You are taking ONE sample from your ticket pool, and each ticket has an equal chance of being drawn, assuming you take them at the same time, and do so randomly. You are NOT dividing the class into, say, desk groups and randomly choosing entire desk groups for your sample. QED, SRS.

    • one year ago
  18. vf321 Group Title
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    **QED was necessary for style points.

    • one year ago
  19. KingGeorge Group Title
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    Ah. It makes more sense now. In a cluster sampling, you also have to take a sample of each cluster. Hence, this can't be CRS, so it must be SRS.

    • one year ago
  20. KingGeorge Group Title
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    ^^I think that's the right idea. Feel free to shoot me down if it's wrong.

    • one year ago
  21. lgbasallote Group Title
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    by SRS we're talking about simple? or stratified?

    • one year ago
  22. KingGeorge Group Title
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    Simple I think.

    • one year ago
  23. vf321 Group Title
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    Simple of course. Stratified sampling can be thought of as homogenous clustering.

    • one year ago
  24. lgbasallote Group Title
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    oh..i thought SRS meant stratified

    • one year ago
  25. vf321 Group Title
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    And stratification would result in an internal SRS for each strata.

    • one year ago
  26. lgbasallote Group Title
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    that was why i was confused with the definition

    • one year ago
  27. vf321 Group Title
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    Well are you all clear now?

    • one year ago
  28. lgbasallote Group Title
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    what is stratified random sampling then?

    • one year ago
  29. lgbasallote Group Title
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    @vf321 ?

    • one year ago
  30. vf321 Group Title
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    I told you, didn't I? "Stratified sampling can be thought of as homogenous clustering," but where each such homogenous cluster has an "internal SRS for each strata." I.e., you don't use the entire strata as your sample.

    • one year ago
  31. lgbasallote Group Title
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    i meant....how does it look like...i not good with understanding stat words

    • one year ago
  32. lgbasallote Group Title
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    you choose part of the cluster?

    • one year ago
  33. lgbasallote Group Title
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    or you divide a population into different clusters and then you select one cluster?

    • one year ago
  34. vf321 Group Title
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    Stratified sampling: I want to observe high school student's attitude towards school assemblies. I know that there may be varying attitudes over grade level. Strata: Freshmen, Sophomores, Juniors, Seniors. Take a SRS (simple RS) of each strata (make sure size of SRS is proportional to grade population): 30 rand selected fresh, 20 r.s. soph., 25 r.s. juniors, 20 r.s. seniors. Sample = 30 + 20 + 25+ 20

    • one year ago
  35. vf321 Group Title
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    This is done so that I have a sample that represents my population well. A whole SRS of the entire high school of size 95 can end up with, say, 50 sophomores, which may skew the results.

    • one year ago
  36. lgbasallote Group Title
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    ohhh

    • one year ago
  37. lgbasallote Group Title
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    but simple random sampling takes all of the population into account?

    • one year ago
  38. vf321 Group Title
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    yes look at my definition above

    • one year ago
  39. lgbasallote Group Title
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    like i said..im not good with stat words...just clarifying

    • one year ago
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