DarkendSinz30
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
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sirm3d
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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.
DarkendSinz30
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what is obsv?
DarkendSinz30
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z=31-39/18.0 correct?
DarkendSinz30
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z=100-39/18.0 = 3.4
DarkendSinz30
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z=31-39/18.0=.44
DarkendSinz30
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is this right so far?
sirm3d
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there is a negative sign
sirm3d
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I. z = -0.44
II. z = 3.4
DarkendSinz30
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okay so I was on the right track then just forgot the negative sign
sirm3d
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just be careful with the signs.
DarkendSinz30
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Thank you so much for the help.