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Question 358:

1

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Yes, if they have the same value. Take the following sample of data (notice 170 is in there twice)

150
100
300
325
170
155
170

The mean of the sample is 195.7 and the standard deviation is 83.5. Using the forumla for z-score (data point - mean )/SD we convert the above to standardized scores and get:

-0.55
-1.15
1.25
1.55
-0.31
-0.49
-0.31

Now the two z-score for 170 are now -0.31.

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