can some please tell me how they got the answer to this statistics problem ?
compute the z score
2400 - 2600
------------------ = 0.30
670
2007-09-20 18:30:09 · 4 answers · asked by maxmac97 1 in Science & Mathematics ➔ Mathematics
could you please show me step by step how to get the answer 0.30 useing the numbers i gave ?
2007-09-20 18:40:27 · update #1
i did 2600-2400 and got 200 then i did 670 divided by 200 and got 3.35
2007-09-20 18:45:16 · update #2
With z scores, you are only interested in the magnitude. You don't care about the negative sign. But mathematically it should be -0.30.
*EDIT*
Oh come on man, you're dividing it the wrong way. It's 200 divided by 670 NOT 670 divided by 200. Were you really unable to figure this out?
*EDIT*
Yahoo should add a feature where answerers get to thumbs down dumb questions.
2007-09-20 18:37:39 · answer #1 · answered by Dr D 7 · 0⤊ 1⤋
First, subtract 2,600 from 2,400. It gives you a total of -200.
If you then divide the -200 by 670 you get 0.2985075 which, when you round it out comes to 0.30.
2007-09-21 01:44:07 · answer #2 · answered by friend robert 1 · 0⤊ 0⤋
z score is the number of standard deviations from the mean. Find the difference between the value and the mean then divide by the standard deviation.
2007-09-21 01:36:34 · answer #3 · answered by Random Maths Guy 2 · 0⤊ 0⤋
2400 should be the result
2600 is the mean
670 is the standard deviation
to find Z-score Z= (result-mean)/ standard deviation
note you have forgotten the sign - in the Z score
2007-09-21 01:42:15 · answer #4 · answered by maussy 7 · 0⤊ 0⤋