Z-Score: Definition | z normal distribution
Contents(General):WhatisaZ-Score?[1]ZScoreFormulas.[2]HowtoCalculateaZ-Score.[3]MoreonZscoresandStandardDeviations.[4]HowisitUsedinRealLife?[5]Contents(Technology):HowToFindaZ-ScoreontheTI-89.[6]HowtoFindaZ-ScoreinExcel.[7]Howtofindacriticalz-valueontheTI-83.[8]Simplyput,az-score(alsocalledastandardscore)givesyouanideaofhowfarfromthemean[9]adatapointis.Butmoretechnicallyit’sameasureofhowmanystandarddeviations[10]beloworabovethepopulationmeanarawscore[11]is.Az-scorecanbeplacedonanormaldistrib...
Contents (General):
What is a Z-Score?[1] Z Score Formulas.[2] How to Calculate a Z-Score.[3] More on Z scores and Standard Deviations.[4] How is it Used in Real Life?[5]Contents (Technology):
How To Find a Z-Score on the TI-89.[6] How to Find a Z-Score in Excel.[7] How to find a critical z-value on the TI-83.[8]Simply put, a z-score (also called a standard score) gives you an idea of how far from the mean[9] a data point is. But more technically it’s a measure of how many standard deviations[10] below or above the population mean a raw score[11] is.
A z-score can be placed on a normal distribution[12] curve. Z-scores range from -3 standard deviations (which would fall to the far left of the normal distribution curve) up to +3 standard deviations (which would fall to the far right of the normal distribution curve). In order to use a z-score, you need to know the mean[13] μ and also the population standard deviation σ.
Z-scores are a way to compare ...