1. Statistics

2. Statistics Vocabulary
Mean: Average; add all the numbers in the data set, then divide by the amount of numbers in the set.
Median: Middle number in a data set when the numbers are arranged in order from least to greatest.
Mode: The number in the data set that occurs most often; can have more than 1 mode.
Range: The largest number in the data set minus the smallest number in the data set.
Outlier: The number that is far away from the majority of data; usually skews the mean.

3. Stem & Leaf Plots Stem: the 1st digit in a term
Put the stem in the 1st or center column in order from least to greatest, vertically.
Leaf: the 2nd digit in a term
Order from least to greatest working from left to right; if a number occurs more than once, write it more than once.
Key/Legend: tells the reader the values of the numbers in the plot.

4. Stem & Leaf Plots Data Set: Key: 3 1 = 31 1 0 0 5 2 0 1 1 3 3 1 2
10, 15, 20, 21, 23, 49, 32, 44, 31, 10, 21
Key: = 31
Make sure the number of leaves match the amount of original data.
Stem Leaf

5. Stem & Leaf Plot Mean = _________ Median = ________ 1 0 0 5 2 0 1 1 3
Mode = _________
Range = ________
Stem Leaf

6. Stem & Leaf Plot
Find the mean, median, mode, and range for the given data.
City Highway
9 1
City
Highway
Mean
Median
Mode
Range
Legend
Means 20 MPG Means 27 MPG

7. Stem & Leaf Plots
Find the difference in the mean for the city and highway.
_________________
What is the average gas mileage for driving in the city and highway?
City
Highway
Mean
Median
Mode
Range

8. Box & Whisker Plot
Box & Whisker Plot: Used to display a set of data so you can easily see where most of the numbers are.
Quartile Quartile Quartile Quartile 4
25% % % %
Minimum
Lower Quartile Range
Median
Upper Quartile Range
Maximum

9. Box & Whisker Plots Steps to create a Box & Whisker Plot
Write your data in order from least to greatest.
Draw a number line that includes all of the numbers in your data.
Find the Median
Find the Lower Quartile Range
Find the Upper Quartile Range
Make a vertical line at the median, lower quartile range, upper quartile range and make a box.
Plot the minimum and maximum; connect to the box with a line.

10. Box & Whisker Plot
Suppose you caught 13 fish in a lake and measured each one. The lengths in inches are as follows:
12, 13, 5, 8, 9, 20, 16, 14, 14, 6, 9, 12, 12.
Mean = _________ Median = __________
Mode = _________ Range = ___________
Outlier = ________

11. Box & Whisker Plots Calculator Steps:
Press STAT then ENTER (Which is the EDIT category) and input your data.
Press 2nd then y= and press ENTER twice. Highlight the box & whisker picture.
Press TRACE. Scroll to find the values of each quartile boundary.

12. Box & Whisker Plots How many pairs of shoes do you own?
28, 26, 19, 20, 15, 5, 3, 10, 15, 7, 8, 5
Mean = _________ Median = __________
Mode = _________ Range = ___________
Outlier = ________

13. Box & Whisker Plots
Find the mean, median, mode, range, and outlier for the ages of the given family members:
15, 16, 12, 21, 42, 43, 16, 50, 54, 30, 35, 16, 50, 47, 5
Mean = _________ Median = __________
Mode = _________ Range = ___________
Outlier = ________

14. Box & Whisker Plots
Team 1
Team 2
Which team has the highest median? _________________
What’s the difference in box range from Team 2 to Team 1?
_______________________
Which team has the lowest range? ___________________