In 2010 consumption (Ci) for selected countries was as follows Jordan 2.5 billion $, USA 100 billion $, Canada 50 billion $, France 40 billion $ Qatar 10 billion $. and Russia 70 billion $. for the same year income (Yi) was: Jordan 12 billion $, USA 900 billion $, Canada 700 billion $, France 500 billion $ Qatar 60 billion $.and Russia 100 billion $. if we want to estimate the following model Ci-B1+B2YI+Ui sigma hat?*
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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