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To choose a starting interval, be sure that it includes the lowest
number (in this case 109).
∴
good starting interval is 100.5-120.5 (note: this is 20 units long
with an extra decimal place added)
Step 3:
Sort the data in a table
Interval
Tally
Frequency
Cumulative
Frequency
100.5-120.5
IIII
4
4
120.5-140.5
III
3
7
140.5-160.5
III
3
10
160.5-180.5
IIIII
5
15
180.5-200.5
0
15
200.5-220.5
I
16
Note:
*Keep counting your intervals by twenty until you’ve included the last
number (in this case, 217).
*A cumulative frequency column in a good way to double check that
you didn’t miss any entries.
b)
Organize data in graphical form.
1
2
3
4
5
6
No_wet_days
110.5
130.5
150.5
170.5
190.5
210.5
freq
(±
)±
sum
StatsLesson1
Bar Chart
Notes:
*The y-axis is frequency
If you are planning
on graphing in
Fathom, note:
1.
As you are
dropping the x
column onto the
empty graph, hold
down the shift key
just before you let it
drop, this will
create a bar graph.
2.
You must
change the formula
at the bottom from
"count" which is the
default to "sum" by
clicking on the
word count and
typing over it.
A break should
be included in

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