1. Standard deviation: Measures the average amount that items vary (deviate) from the mean of an entire data set.

2. Same mean and median, but different variability.
Example:
Data set #1:
40, 70, 100
Mean =
Median =
Data set #2:
69, 70, 71
Mean =
Median =
Same mean and median, but different variability.
(Diverse data vs. concentrated data.)

3. Variance: Another statistic used to describe the spread of data about the mean.

4. To compute the standard deviation of a data set:
1st: subtract the mean from each data point, then square each result.
3rd: apply a square root
2nd: add, then divide the results to get an average measure 4

5. down if you did NOT save the helpful hints!!
listed on the gold “check answers” & helpful hints handout from two days ago:
Please write this
down if you did NOT save the helpful hints!!

6. Notation you will find in your calculator:
*Very important!
Notation you will find in your calculator:

8. down if you did NOT save the helpful hints!!
listed on the gold “check answers” & helpful hints handout from two days ago:
Please write this
down if you did NOT save the helpful hints!!

9. p. 914 #6 Find the mean deviation and standard deviation. Show work! $4.45, $5.50, $5.50, $6.30, $7.80, $11.00, $12.20, $17.20

10. When solving for Mean Deviation: Write the calculator command that you are using and fill in the appropriate numbers.
newer operating system

11. See HINT for #17-19 at the bottom of yesterday’s check answer sheet:OR