Exploring standard deviation

The first instance of  is under the Probability and statistics Math Mission. This exercise explores the relationship between a dot plot and the standard deviation.

Types of Problems
There is one type of problem in this exercise:


 * 1) ''Control the standard deviation: This problem has a number line with several dots on it. The student is asked to move the dots to adjust the standard deviation to a given value.Expsd.png

Strategies
This exercise is easy to get accuracy badges because the manipulative displays the current approximate standard deviation while you are moving dots. The speed badges are easy because you can move dots quickly on the manipulative and the standard deviation only needs to be approximate.


 * 1) Don't submit until you have the right standard deviation, you can read it from the line.
 * 2) It is easiest to move a dot on the far left and drop it near the center to decrease the standard deviation. If it is still not low enough, take a dot from the far right and move it towards center. Repeat until you get the right value.