Statistics

Assessment statements for statistics unit (which has now been discontinued): media type="custom" key="20681322" align="center"

And here is an excellent powerpoint that provides some useful explanations:.

media type="custom" key="20681356" align="center"

Standard deviation may sound complicated but once you know the steps involved you can calculate it easily. It will take you some time to get the hang of it but a little practice will help you get there.

Here are the statistics presentations that were shown in class (thanks to S. Taylor of the Bandung school for this):



THIS IS A WORKSHOP THAT SHOULD ALLOW YOU SOME PRACTICE IN USING DATA ANALYSIS METHODS.



This presentation from Tracy high school is a very good resource to go with the worksheet given in class:
 * BELOW ARE SOME ADDITIONAL RESOURCES THAT YOU MAY USE TO HELP YOU UNDERSTAND THE TOPIC.**



And if you need to view the worksheet, here it is:



And from Mr. Lau´s class in Oklahoma:



Here is a very useful video that will take you through the calculation of the standard deviation of your data sets. Not only will it help to put things into perspective but it will also allow you to recognise the symbols used in this calculation.

media type="youtube" key="qqOyy_NjflU" height="480" width="853"

The relevance of the t-test is explained below:

media type="youtube" key="QoV_TL0IDGA" height="480" width="640" align="center"

How to do a t-test on excel is explained in this **very helpful video** below (follow this for your project):

media type="youtube" key="JlfLnx8sh-o" height="600" width="800" align="center"


 * REMEMBER THAT THE FINAL NUMBER OBTAINED IN THE VIDEO IS THE FINAL __P__- __VALUE__ FOR THE T TEST, IT IS NOT THE T VALUE. IF THIS P VALUE IS HIGHER THAN 0.05 THEN YOUR NULL HYPOTHESIS IS SUPPORTED.**

__HOWEVER,__ if you are working out the t value on your own it must be compared to the appropriate critical value (for t) for the relevant degrees of freedom. If your calculated t value is **higher** than the critical value then there **IS** a significant difference between your samples. **IN OTHER WORDS THE NULL HYPOTHESIS IS REJECTED.**

For your first project in diploma you will be expected to properly process and graph the data you collect. Using excel to graph your data appropriately is explained here (**remember to choose the right type of graph for your data**):

media type="youtube" key="Gdu8bNK1Yqg" height="480" width="640" align="center"

Below you will find the link to a site where you can practice the use of the standard deviation function of your calculator (check the answers to ensure you are getting the right answers!)

[|Mean and Standard deviation problem set]

Here is a review sheet that you can use to test your knowledge on statistics.