Download presentation

Presentation is loading. Please wait.

Published byMarkus Fordham Modified over 3 years ago

1
Based upon the Empirical Rule, we know the approximate percentage of data that falls between certain standard deviations on a normal distribution curve. Example: If a class of test scores has a mean of 65 and standard deviation of 9, then what percent of the students would have a grade below 56? CAN YOU DO THIS?...What percent of the students would have a grade of 70 or higher?

2
**Standardized Scores (aka z-scores)**

Z-score represents the exact number of standard deviations a value, x, is from the mean. mean observation (value) standard deviation Example: (test score problem) What would be the z-score for a student that received a 70 on the test?

3
Example: The mean speed of vehicles along a particular section of the highway is 67mph with a standard deviation of 4mph. What is the z-score for a car that is traveling at 72 mph? The speed of that car is 1.25 standard deviations ABOVE the mean. 1.25 -1.75 | | | | | | | (z =) What is the z-score for a car that is traveling 60mph? The speed of that car is 1.75 standard deviations BELOW the mean.

4
**To find the percentage or probability that a certain interval is possible, we use the z-score table.**

The z-score table always tells the percentage (as a decimal) to the LEFT of that z-score value. What percentage of the data will have a z-score of less than 1.15? P(z < 1.15) To get a percentage to the RIGHT of a z-score, you would just subtract the TABLE value from 100%.

Similar presentations

Presentation is loading. Please wait....

OK

Commonly Used Distributions

Commonly Used Distributions

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on relation and function free download Ppt on ip address classes and special ip Ppt on high voltage engineering Ppt on 2d and 3d figures 2nd Ppt on reflection of light for class 7 Ppt on data handling for class 7 Ppt on water scarcity in the united Ppt on petroleum industry in india download Ppt on corporate etiquettes of life Ppt on bmc remedy