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diff --git a/SI/Resource/Fundamentals of Data Mining/Content/Z-score.md b/SI/Resource/Fundamentals of Data Mining/Content/Z-score.md new file mode 100644 index 0000000..34730a6 --- /dev/null +++ b/SI/Resource/Fundamentals of Data Mining/Content/Z-score.md @@ -0,0 +1,20 @@ +--- +id: Z-score +aliases: + - Z-score - An example +tags: [] +--- + +### Z-score - An example + +- John gets a mark of 64 in a physics test, where the mean is 50 and the + standard deviation is 8. +- Jane gets a mark of 74 in a chemistry test, where the mean is 58 and the + standard deviation is 10 + +Who has a better class performance? + +- John's z = (64 - 50) / 8 = 1.75 +- Jane's z = (74 - 58) / 10 = 1.6 +- Although Jane's score is higher, John's score is further above the mean, and + it might be concluded that John has achieved greater success. |