Download presentation

Presentation is loading. Please wait.

Published byTerrell Utley Modified over 3 years ago

2
Z-scores A z-score or standardised score looks at how many standard deviations a score is above or below the mean.

3
Z-scores x-scale 0123 11 22 33 z-scale

4
Example 1 Kathini drinks strawberry milk each morning. She drinks an average of 340ml each morning with a standard deviation of 10ml. a) What is the z-score on a morning she drinks: i) 330mlii) 356ml b) What could you say about a day she drinks 371ml? a i)a ii) b) A z-score of 3·1 lies in the top 0·15% of the mornings. This may be considered an outlier, (maybe she drinks too much milk!)

5
Example 2 a) Sarah got a z-score of 2·1 on a test. What does this mean? b) This means that her score was 2·1 standard deviations above the mean. b) Aidan got a z-score of 1·7 on a test with a mean of 60%. If his mark was 94%, what was the standard deviation? c) Tim got a z-score of -1·3 on a test with a mark of 57%. If the standard deviation 10%, what was the mean mark? c)

6
Today’s work Exercise 10-02 - Sheet Q1→5 & 10

Similar presentations

OK

Personnel Management FCMAT 2006 Update Delia Ruiz, Executive Officer of Human Resources January 10, 2007.

Personnel Management FCMAT 2006 Update Delia Ruiz, Executive Officer of Human Resources January 10, 2007.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on class 10 hindi chapters Ppt online application form 2016 Ppt on service oriented architecture Ppt on mood disorders Ppt on fire extinguisher types and sizes Ppt on artificial intelligence download Ppt on order of operations 5th grade math Ppt on business plan for new business Ppt on iron and steel industry in india Ppt on nelson mandela free download