Range, quartiles, and interquartile rangeswarna sudha
The IQR describes the middle 50% of values when ordered from lowest to highest. To find the interquartile range (IQR), first find the median (middle value) of the lower and upper half of the data. These values are quartile 1 (Q1) and quartile 3 (Q3). The IQR is the difference between Q3 and Q1.
This presentation includes an introduction to statistics, introduction to sampling methods, collection of data, classification and tabulation, frequency distribution, graphs and measures of central tendency.
Range, quartiles, and interquartile rangeswarna sudha
The IQR describes the middle 50% of values when ordered from lowest to highest. To find the interquartile range (IQR), first find the median (middle value) of the lower and upper half of the data. These values are quartile 1 (Q1) and quartile 3 (Q3). The IQR is the difference between Q3 and Q1.
This presentation includes an introduction to statistics, introduction to sampling methods, collection of data, classification and tabulation, frequency distribution, graphs and measures of central tendency.
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Ghadeer suwaimil
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2. Stem-and-Leaf Plot
Uses place value to organize data
Shows data in an organized way so it
can be analyzed easily
Organizes data so it is easier to find
the median, mode, and range
3. Here are the scores for a
freshman basketball team
Here is the same data organized into a
stem-and-leaf plot.
4. Can you tell how the
stem-and-leaf plot was made?
The first number
in the data is 27.
Here is the 2 in
the tens place.
Here is the 7 in
the ones place.
5. The key shows us
which place value
the digits represent.
6. The stems all
represent tens
place in this
stem-and-leaf
plot.
The leaves all
represent ones.
8. Here are one student’s math test scores.
Make a stem-and-leaf plot for this data.
First, draw
the dividing
lines.
9. Here are one student’s math test scores.
Make a stem-and-leaf plot for this data.
Stems
Next, label
the stem side
and the leaf
side.
Leaves
10. Here are one student’s math test scores.
Make a stem-and-leaf plot for this data.
Stems Leaves
7 5
Find the
smallest
piece of data
and plot it on
the grid.
11. Here are one student’s math test scores.
Make a stem-and-leaf plot for this data.
Stems Leaves
7 5 9
Find the next
smallest
piece of data
and plot it on
the grid.
The 7 for the tens
place is already
there. We just
add the 9.
12. Continue with this process until
you have entered all the data.
Stems Leaves
7 5 9
8 3 4 6 6 8
9
1 4 9
13. Remember to add a title.
Test Scores
Stems Leaves
7 5 9
8 3 4 6 6 8
9
1 4 9
14. Don’t forget the key!
Test Scores
Stems Leaves
7 5 9
8 3 4 6 6 8
9
1 4 9
Key: 7 5 means 75
20. Using Stem-and-Leaf Plots
Boxes of Girl Scout Cookies Sold by Troop 220
What was the least number of cookies sold?
40 boxes
21. Using Stem-and-Leaf Plots
Boxes of Girl Scout Cookies Sold by Troop 220
What was the largest number of cookies
sold?
94 boxes
22. Using Stem-and-Leaf Plots
Boxes of Girl Scout Cookies Sold by Troop 220
Find the median of the data
Find the middle leaf…
63 boxes
23. Using Stem-and-Leaf Plots
Boxes of Girl Scout Cookies Sold by Troop 220
Find the mode of the data
Look for the number that occurs
most often in a row of leaves
63 boxes
