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anonymous

  • one year ago

Does anyone know about z scores? I am having a hard time. On some of the questions, I get part of it, but don't know how to finish the problem. Can anyone help me,please?

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  1. jim_thompson5910
    • one year ago
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    go ahead

  2. anonymous
    • one year ago
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    The shaded area is z= .18

  3. anonymous
    • one year ago
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    mean 0 and standard deviation is 1

  4. jim_thompson5910
    • one year ago
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    so it gave you a probability 0.18 and it wants you to find a z-score? or the other way around?

  5. anonymous
    • one year ago
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    find the area of the shaded region. the graph depicts the Standard normal distribution with mean 0 and SD 1.

  6. anonymous
    • one year ago
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    The area of the shaded region is......

  7. jim_thompson5910
    • one year ago
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    ok so it sounds like they gave you a z score of z = 0.18

  8. jim_thompson5910
    • one year ago
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    how is the shaded region set up? to the right of the z-score? or to the left?

  9. anonymous
    • one year ago
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    to the left

  10. jim_thompson5910
    • one year ago
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    ok so you can use a table like this one https://www.stat.tamu.edu/~lzhou/stat302/standardnormaltable.pdf

  11. jim_thompson5910
    • one year ago
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    locate the row that starts with 0.1 (on page 2)

  12. jim_thompson5910
    • one year ago
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    then find the column that has 0.08 up at the top the intersection of the "0.1" row and "0.08" column has 0.57142 in the cell so that means P(Z < 0.18) = 0.57142

  13. anonymous
    • one year ago
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    OMG!!!! Thank you so much!!! You're a lifesaver. I've been sitting here trying everything!

  14. anonymous
    • one year ago
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    I should be able to use the chart for all z score problems, correct?

  15. jim_thompson5910
    • one year ago
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    Yes that is correct. You can also use a TI83 or TI84 calculator to do the same thing more or less. The calculator allows you to use values not found on the table you use the normalcdf function

  16. jim_thompson5910
    • one year ago
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    tables like these should be found in the back of your stats book in the appendix

  17. anonymous
    • one year ago
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    Ok. Thank you again!

  18. jim_thompson5910
    • one year ago
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    you're welcome

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