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Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
Data set potential outlier if left or right ?
Introduction:
Suppose Q1 and Q3 denote the first and third quartiles of a data set, respectively. Then, the interquartile range (IQR) of the data set is, IQR = Q3 – Q1.
An observation is a potential outlier, if it lies below (Q1 – 1.5 IQR) or above (Q3 + 1.5 IQR).
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