Journal of Economic, Political and Business Analysis XIV (2) delivers a report on the stagnation of the ceramic industry in Indonesia. The causes of stagnation are inefficiency, decreased purchasing power and increased production costs. Following is the development of sales in 2001 and 2002. • Calculate the average, median and mode scores for the 2 years of sales • How is the relationship between these concentration sizes. • What are your comments on the development of sales from 2001 to 2002? And in what year the sales frequency of the above companies was more stable.
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.
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