Can A Z Score Be Negative

Brent Mccoy
• Monday, 04 January, 2021
• 7 min read

95% of data values fall within two standard deviations of the mean. 99.7% of data values fall within three standard deviations of the mean.

table distribution negative positive normal curve scores extra score chart ve web posted faculty learn notes
(Source: faculty.ccp.edu)


• Then, the intersecting point of the columns and rows provides us with the area under the normal curve or the probability. The average score was 500 (µ) and the standard deviation was 120 ().

Use this free online NegativeZscore chart to find the values of negative z-scores for the corresponding first and second digits after the decimal point of the score in the normal distribution table. The given negativezscore chart is used to look up standard normal probabilities.

Score: It is a way to compare individuals in a set of data. It shows how far away a particular score is from the group mean using standard deviation for that population to define the scale.

Typically, a score below 1.8 indicates that a company is likely heading for bankruptcy. Standard deviation is essentially a reflection of the amount of variability within a given data set.

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