from a handpicked tutor in LIVE 1-to-1 classes
A data value is considered _______ if its z-score is less than minus−2 or greater than 2.
Solution:
Z-score is a numerical measurement used to describe a value's relationship to the mean of a group of values.
Z-score is measured in terms of standard deviations of values from their mean.
If a Z-score is 0, it means that the data point's score is identical to the mean score, while a Z-score of 1.0 would indicate a value that is one standard deviation from the mean.
z-score is a measure of how close the given data point is to the mean of the values given with the standard deviation.
We know that
If the z-score is greater than or equal to -2, or less than or equal to -2, then the data is ordinary
If the z-score is less than -2 or greater than 2, then the data is unusual.
Therefore, a data value is considered unusual if its z-score is less than minus 2 or greater than 2.
A data value is considered _______ if its z-score is less than minus−2 or greater than 2.
Summary:
A data value is considered unusual if its z-score is less than minus -2 or greater than 2.
visual curriculum