If a z-score is 1.33 and tells you that 1.33 is the standard deviation from the mean, is the z value positive or negative?

- anonymous

- katieb

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- IsTim

Do you have a Z-Score chart with you?

- IsTim

Wait, do you need a z-score chart?

- anonymous

No. i don't but the z score is 1.33 so I am guessing that the z score is negative but i am not sure

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## More answers

- IsTim

I always thought you could tell the if the z-score was positive or negative based on whether or not it had a negative sign in front of it...

- anonymous

I think that Since Z = (score-mean)/standard deviation, scores below the mean will have a negative value, and those above the mean will have a positive value.

- anonymous

weren't you told that the z-score is 1.33 > 0 (??)

- IsTim

You know about the graph/diagram right?

- anonymous

I was told that the z score was 1.33 which is 1.33 sd from the mean

- anonymous

Tim, I do not know about the graph/diagram

- anonymous

Broken Fixer do you think that I am correct that the z score is negative?

- IsTim

The graph you draw to solve problems usually.|dw:1327803029445:dw||dw:1327803073992:dw|

- anonymous

Thanks. I am still not sure if I am correct or not that my z score is negative value.

- IsTim

I think it's negative. But I don't know what the mean is. I think that the 1.33 is below the mean in this case thought. REally, I just don't know...

- anonymous

Thanks Tim. I agree. I believe that the 1.33 is below the mean of 17 thus making it a negative z score value, but I am not positive.

- anonymous

? I'm not sure I agree. If you're told that the z value is 1.33, then the z value is 1.33 > 0. If the z value was negative then the z value would have been -1.33.

- IsTim

That's what I thought at first. I was just getting confused though.

- IsTim

You're probably right.

- anonymous

What I was thinking Broken Fixer was. Since Z = (score-mean)/standard deviation, scores below the mean will have a negative value, and those above the mean will have a positive value. The mean is 17 and the z score is 1.33 the z value would be negative. The score was 21 and the mean was 17 standard deviation would be 3

- anonymous

when z = +1.33, you have a raw score that is 1.33 standard devs above the mean of the data

- anonymous

(am I missing part of the problem? where did 17 come from)

- anonymous

x = 21, sigma = 3, mu = 17 will give you z = +1.33 > 0 yes

- anonymous

The raw score is 21 you would subtract the mean of 17 from 21 and divide theat result (4) by the standard deviation of 3. The z-score of 1.33 tell

- anonymous

"z value" is a synonym for "z" is a synonym for "z score" and in this case it is 1.33 >0, because x is above the mean.

- anonymous

so are you saying that the z score in this case is positive?

- IsTim

I agree. I don't remember why I said negative. I know you disagree with this, and probably feel unsatisfied. Try looking through your textbook, or ask another source.

- anonymous

No I aactually get it now and agree. Aftere reading the book again and reading what you and Broken Fixer said, I agree that it is infact a positive value. Thanks for helping me through this!

- IsTim

Wonderful. Glad we helped.

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