1. Get your calculator! 3-26-13 Describing Data
EQ: How would you describe real-world data using the median or mode as a measure of center, and range as a measure of variability? How would you describe a data distribution?
BOP - A team scored the following number of points in its last eight games: 15, 24, 17, 19, 21, 38, 25, 39
Which number is the lower quartile for this data set? A. 31
B. 23
C. 18
D. 17
DWP: A kitchen is shaped like a rectangle with dimensions of 11 ½ by 9 ½ ft. The floor of the room is made of square tiles with a side length of ½ ft. What is the number of tiles that will cover the kitchen floor?

2. A team scored the following number of points in its last eight games:
15, 24, 17, 19, 21, 38, 25, 39
Which number is the lower quartile for this data set? A. 31
B. 23
C. 18
D. 17
Answer: C
Former EOG Grade 7 Sample Items Goal 4, #2
DWP: A kitchen is shaped like a rectangle with dimensions of 11 ½ by 9 ½ ft. The floor of the room is made of square tiles with a side length of ½ ft. What is the number of tiles that will cover the kitchen floor? 437 tiles

3. BOP - A notebook costs $4. 50 plus sales tax
BOP - A notebook costs $4.50 plus sales tax. After sales tax, the notebook is $ What is the sales tax rate?
A . 6% B. 7% C. 8% D. 9%
Check homework

4. VOCABULARY
statistical question
Anticipates variability or differences in the answers given to the poll
Population
Or target
Defined by common characteristics;
For example middle school students
random sample
Each member of the target population has an equally likely chance of occurring
categorical data
When the categories for the data collected are words; for example: favorite book, current book you are reading
numerical data
When the data collected is numbers; for example: how many books did you read this year

5. Data is often collected to make predictions or
determine what is happening within a
given group.
In order for data to accurately depict a population,
The data must be collected from a
RANDOM SAMPLE.

6. IS IT RANDOM?

7. Below is the data collected from two random
samples of 100 students regarding student’s
school lunch preference. Make at least two
inferences based on the results.

8. Name others… Shoe size Birth year Number of books read
Classify each of the following as categorical or
numerical (quantitative) data:
Birth year
Number of books read
Favorite genre of books
Shoe size
Zip code
Name others…

9. The two data sets below depict random samples of the management
Salaries in two companies. Based on the salaries below which measure
Of center will provide the most accurate estimation of the salaries for
Each company?

10. Name some ways that data can be organized:
Frequency tables,
Stem and leaf plots
Bar graphs
Box plot
Dot plot
Histogram
Circle graph
Line graph
Others?

11. Once data is organized it can be described by:
CENTER - Mean or Median
SPREAD - Range, Interquartile Range and Mean Absolute Deviation (M.A.D)
SHAPE-Mound Shape, Skew Right, Skew Left, and Uniform

12. Skewed right -
Extreme low values
on the right
Mounding or
bell shaped

13. Skewed left -
extreme low values
On the left
Uniform

15. Work on review handout.
Finish for homework.

16. EXIT ACTIVITY:
3 - Name three things you have learned about data and statistics
2 - Name two things you are still unsure about.
1 - Name one thing you want to learn more about.