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annipuppi

  • one year ago

Question involving z-scores... I'm really confused

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  1. amistre64
    • one year ago
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    oy thats alot of words ...

  2. amistre64
    • one year ago
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    we have human x-bar, and human S values .. do you know what those refer to?

  3. annipuppi
    • one year ago
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    I have no idea...

  4. amistre64
    • one year ago
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    x-bar is a sample mean S .... has to be defined in your material somewhere as well. what would you think it should tell us?

  5. amistre64
    • one year ago
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    standard deviation is my guess

  6. amistre64
    • one year ago
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    now, there is a formula that should have been presented to you in your course ... it allows us to calcuate a zscore; given a random variable value for x, a sample mean of x-bar, and a standard deviation.

  7. amistre64
    • one year ago
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    can you find that zscore formula?

  8. annipuppi
    • one year ago
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    z score= x-mean/standard deviation

  9. amistre64
    • one year ago
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    right so they give us the values, all we have to do is compute z for waists, what are our x, mean, and standard deviation?

  10. amistre64
    • one year ago
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    ok, so lets just subtract the means from the dolls; and then divide off the S doll: 75.0 56.5 72.0 -mean:-91.2 -80.9 -93.7 ------------------------ -16.2 -24.4 -21.7 /S /4.8 /9.8 /6.8 ----------------------- z1 z2 z3

  11. amistre64
    • one year ago
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    i agree with those values

  12. amistre64
    • one year ago
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    so what can we consider; given a 95% : 5% ratio for normaility

  13. amistre64
    • one year ago
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    do you recall your empirical rule for approximating with standard deviations?

  14. annipuppi
    • one year ago
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    Like I said the material isn't comprehensive at all but I know that 95% of the data falls within 2 standard deviations

  15. amistre64
    • one year ago
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    that was what i was looking to see :) so anything less than z=-2 falls outside the range of what is considered 'acceptable' or 'normal'. do we have any values for z that are less than -2?

  16. annipuppi
    • one year ago
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    all three values are less than -2

  17. amistre64
    • one year ago
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    then we could argue that the dolls proportions exhibit measurements that are less than the acceptable threshold ... they are below the 'minimum' values for normality. right?

  18. annipuppi
    • one year ago
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    yes

  19. amistre64
    • one year ago
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    of course the wording; "the most different" might suggest that the -3 values are what they are looking to argue with. how you process this is highly subjective :)

  20. annipuppi
    • one year ago
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    That's what I figured they meant. Thank you! I actually understand it now!

  21. amistre64
    • one year ago
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    good luck :)

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