## Mean and Standard Deviation Interactive Quiz

Click here for corresponding Excel table.

- How many students are in the class?
- 30
- 7

- What is the mid Interval value for the interval 6-8?
- 3
- 7

- In the (Mid Interval - Mean) column in the table, is it true values less than the mean will give a negative value for the (Mid Interval -Mean) column?
- Yes
- 7

- After the (Mid Interval - Mean) has been squared must we multiply it by the frequency, true or false?
- False
- True

- Which of the following is the formula for standard deviation?
- Reset the table and run the arrows again. Now if the number of people in the Interval 12-14 increased by 4, would the mean increase?
- No
- Yes

- If the number of people in the interval 0-2 increased by 4, would it have the same effect as the interval 12-14 increasing by 4?
- No
- Yes

- If you remove all of the students in the 4-6 interval, what effect will it have on the Standard Deviation?
- It increases
- It decreases

- Now click the Reset button on the table, and fix it so that all 30 students are in the 6-8 interval, what is the standard deviation?
- 30
- 0

- If all the students were in the range 12-14, then the Standard Deviation would be 0?
- True
- False