- FINDING A Z-SCORE
2. Find the z-score that corresponds to a cumulative area of .8925.
- TRANSFORMING A Z-SCORE TO AN X-VALUE
standard deviation
- FINDING A SPECIFIC DATA VALUE FOR A GIVEN PROBABILITY
Examples:
The score for each student of a quiz is entered into a spreadsheet and a histogram created from the data. Suppose the histogram is bell-shaped, symmetrical about mean of 50 and st. dev of 10. What can we say about someone with a score of 50?
Answer:
The z-score is (50-50)/10 = 0. Interpretation: student score is 0 distance (in units of standrd deviations) from the mean, so the student has scored average.
Websites:
https://statistics.laerd.com/statistical-guides/standard-score-2.php
http://www.gla.ac.uk/sums/users/jdbmcdonald/PrePost_TTest/zscores2.html
http://www.statisticshowto.com/how-to-calculate-a-z-score/
http://www.ltcconline.net/greenl/courses/201/probdist/zScore.htm
http://www.regentsprep.org/regents/math/algtrig/ats7/zchart.htm