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DarkendSinz30

  • 3 years ago

A Math test has a mean of 39 and standard deviation of 18.0. Find the corresponding z scores for: I. a test score of 31 II. a test score of 100 Please show all of your work

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  1. sirm3d
    • 3 years ago
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    the z score formula is \[z=\frac{ obsv - mean }{ std.dev. }\] i'll leave the computation to you. post your answers here.

  2. DarkendSinz30
    • 3 years ago
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    what is obsv?

  3. DarkendSinz30
    • 3 years ago
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    z=31-39/18.0 correct?

  4. DarkendSinz30
    • 3 years ago
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    z=100-39/18.0 = 3.4

  5. DarkendSinz30
    • 3 years ago
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    z=31-39/18.0=.44

  6. DarkendSinz30
    • 3 years ago
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    is this right so far?

  7. sirm3d
    • 3 years ago
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    there is a negative sign

  8. sirm3d
    • 3 years ago
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    I. z = -0.44 II. z = 3.4

  9. DarkendSinz30
    • 3 years ago
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    okay so I was on the right track then just forgot the negative sign

  10. sirm3d
    • 3 years ago
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    just be careful with the signs.

  11. DarkendSinz30
    • 3 years ago
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    Thank you so much for the help.

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