1. Mean Absolute Deviation

2. Who's the best guesser?
You are going to be picking an age for the celebrity that comes up in the picture. Write down each name and age guessed on your paper. We are going to make a table out of this information.

3. Who's the best guesser?
How old is this person?

4. Who's the best guesser?
How old is this person?

5. Who's the best guesser?
How old is this person?

6. Who's the best guesser?
How old is this person?

7. Who's the best guesser?
How old is this person?

8. Who's the best guesser?
How old is this person?

9. Who's the best guesser?
How old is this person?

10. Who's the best guesser?
How old is this person?

11. Who's the best guesser?
How old is this person?

12. Who's the best guesser?
How old is this person?

13. Who's the best guesser?
How old is this person?

14. Who's the best guesser?
How old is this person?

15. Who's the best guesser?
How old is this person?

16. Who's the best guesser?
Now, lets find out the real age of each of these celebrities
Write the actual age down next to the guess you made.

17. Who's the best guesser? Beyonce 29 Brad Pitt 47 Kanye West 33
Nelson Mandela
Barack Obama
Hillary Clinton
Oprah Winfrey
Stevie Wonder 29 47 33 92 49 63 57 60

18. Who's the best guesser? LeBron James 26 Tyler Perry 42 Simon Cowell 52
Tiger Woods
Will Smith 26 42 52 35

19. Who's the best guesser?
In the next column, write down the difference between your guess and the actual value. Write down the positive number difference.
Then, add up all of your differences and write the total at the bottom

20. Who's the best guesser? Make a scatter plot of the data on your paper.
On the x-axis plot the actual ages
On the y-axis plot your estimate

21. Who's the best guesser?
The last step is to divide the sum of the differences by the number of guesses.
What number did you get?
The person with the lowest number is the winner!
This is called mean absolute deviation!

22. Math I
EQ:
How do you find the mean absolute deviation (MAD) of a data set?

23. Mean Absolute Deviation

24. How do I do that? 1st Find the mean
2nd Subtract each data from the mean
3rd Take the absolute value of each difference
4th Add it up and divide by the number of data

25. Mean Absolute Deviation
The numbers below are the golf scores for the UGA golf team. Find the mean absolute deviation of the data.
68, 70 , 72, 73, 74, 75
Mean = 72

26. Mean Absolute Deviation
The numbers below are the total points for the Druid Hills basketball team in its last 10 games. Find the Mean Absolute Deviation.
72, 75, 73, 99, 68, 79, 48, 60, 52, 59
11.1

27. Vocab: Measures of Central Tendency
Mean: aka: average; denoted by the symbol x, which is read x-bar.
Median: the middle number when values are written in numerical order.
Mode: the value that occurs most frequently
Measure of dispersion: describes the spread of data
Range: the difference between the greatest value and least value of a numerical set of numbers
Deviation from the mean: the difference of a data value and the mean of a data set
Mean absolute deviation: the average deviation of the data from the mean.

28. Sample Statistics Median: Separates the data into ___ equal parts
Quartiles: Separate the data into ____ equal parts
Upper Quartile: The median of the upper half of the data
Lower Quartile: The median of the lower half of the data
Range: The difference between the highest and lowest values in a data set
Interquartile Range: The difference between the upper quartile and the lower quartile.

29. Read this Plot! List the Following: Median: Range: Quartile 1:
Interquartile Range:

30. Example 1

31. Example 3
Use the data: