Percentage distributions are useful in comparing two frequency distributions having different total frequen-cies. Construct percentage distributions from the follow-ing two frequency distributions and determine whether the distributions of daily absences in the two departmentsfollow similar patterns. FREQUENCIESClass Shipping SecurityLimits Department Department0–1 26 182–3 18 114–5 10 76–7 4 38–9 2 1Totals 60 40
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.
cies. Construct percentage distributions from the follow-
ing two frequency distributions and determine whether
follow similar patterns.
Class Shipping Security
Limits Department Department
0–1 26 18
2–3 18 11
4–5 10 7
6–7 4 3
8–9 2 1
Totals 60 40
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