the Chi Square distribution is a mathematical distribution that is used directly or indirectly in many tests of significance. The most common use of the chi square distribution is to test differences among proportions
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You use the percentages and record them.
for which dieses we use the tablet
You can use a bar graph when you are working with numers. :)
If the distribution is Gaussian (or Normal) use z-scores. If it is Student's t, then use t-scores.
Companies use probability in many different ways. For example, they may use it for quality control, or for risk analysis.