Download presentation

Presentation is loading. Please wait.

Published byAubrey Shipley Modified over 2 years ago

1
**A quick review of z-scores and how to understand them August 26, 2011**

What is a Z-Score? A quick review of z-scores and how to understand them August 26, 2011

2
Z-Score “Cheat Sheet” Z-scores are a standardized measure that helps you compare individual student (or school) data to state average data. Student z-score = (Student Scale Score) – (Statewide average of scale scores) Standard Deviation of Scale Score School z-score= (School Value) – (Statewide average of that value) Standard deviation of that value

3
**Z-Score “Cheat Sheet” Z-scores are centered around zero**

Positive numbers mean the student or school is above the state average Negative numbers mean the student or school is below the state average State Average …Worse than state average Better than state average…. -3 -2 -1 1 2 3

4
Z-Score Examples Your school has a z-score of You are better than the state average. Z-score of 1.5 State Average …Worse than state average Better than state average…. -3 -2 -1 1 2 3

5
Z-Score Examples Your school has a z-score of .2. You are better than the state average, but not by a lot. Z-score of 0.2 Z-score of 1.5 State Average …Worse than state average Better than state average…. -3 -2 -1 1 2 3

6
Z-Score Examples Your school has a z-score of You are very far below state average. Z-score of -2.0 Z-score of 0.2 Z-score of 1.5 State Average …Worse than state average Better than state average…. -3 -2 -1 1 2 3

Similar presentations

OK

z – Score Percentiles Quartiles A standardized value A number of standard deviations a given value, x, is above or below the mean z = (score.

z – Score Percentiles Quartiles A standardized value A number of standard deviations a given value, x, is above or below the mean z = (score.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on power factor meter Ppt on fibonacci numbers and the golden Ppt on revolution of the earth and seasons solar Ppt on latest technology in civil engineering Ppt on shipping industry in india Ppt on 3d internet technology Ppt on l&t finance holding Download ppt on abdul kalam Ppt on object-oriented concepts in c++ Ppt on world environment day slogans