Probability values and z scores

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SUMMARY

This discussion centers on calculating z-scores from given probability values. To find the z-score, users should reference the "probability" column of a standard normal distribution table. Alternatively, software packages can utilize the NORMINV function, which computes the inverse of the normal distribution, effectively converting probability values into z-scores.

PREREQUISITES
  • Understanding of standard normal distribution
  • Familiarity with z-scores and p-values
  • Basic knowledge of statistical tables
  • Experience with statistical software packages
NEXT STEPS
  • Research the use of the NORMINV function in Excel or similar software
  • Study the properties of the standard normal distribution
  • Learn how to interpret z-scores in the context of hypothesis testing
  • Explore alternative methods for calculating z-scores, such as using Python libraries like SciPy
USEFUL FOR

Statisticians, data analysts, students in statistics courses, and anyone involved in hypothesis testing or statistical analysis.

nellas
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Can someone explain how to do this. I am totally stuck.
How do you find the z score of you are given the probability? I understand and can calculate the p value from the z score but cannot seem to do it in the opposite direction
Thanks
 
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Look up the probability in the "probability" column of the table and take the corresponding z-score. If you are using a software package, look for something like NORMINV, the inverse normal distribution function.
 

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