1. Bellwork
Tuesday, April 17th
Calculate the x & y intercepts from the graph. Write your answer as an ordered pair.

2. Organizing and Displaying Data
If data…
Then use…
is organized into categories where you can see how many are in each category…
a bar graph
changes over a period of time…
a line graph
compares categories to a whole set so you can see the percentage for each category…
a circle graph

3. Line graphs are good to show change over time.
County Farms
248
What type of graph would you use to best represent this data?
A. Bar graph
B. Line graph
C. Circle graph
Why??
Line graphs are good to show change over time.

4. Degrees Held by Faculty
What type of graph would you use to best represent this data?
A. Bar graph
B. Line graph
C. Circle graph
Why??
Circle graphs are good to show parts of a whole.

5. Bar graphs are good to show the number in each category.
Flowers for Mom
What type of graph would you use to best represent this data?
A. Bar graph
B. Line graph
C. Circle graph
Why??
Bar graphs are good to show the number in each category.

6. How much the axis goes up by
Bar graphs can be misleading because…
the y-axis doesn’t start at zero
the scale isn’t even
** A scale on a graph means:
How much the axis goes up by

7. What’s misleading about this graph?
About how many times taller is the Democrats bar than the other bars?
How can you change the graph to make it appear more accurate?
It appears to be nine times as tall
100 democrats, 100 republicans, and 100 independents were asked…
It looks like the Democrats had nine times as many people agree than everyone else.
Make the y-axis start at zero so the bars aren’t so stretched out.
Ms. Batliner thinks teachers should get paid more. Do you agree?

8. The same data:
Same data!

9. What’s misleading about this graph?
A survey was taken to determine favorite food.
Which bar appears to
be the size of the
Hot Dogs bar?
About how many times taller does the Hot Dogs bar appear to be than the Pizza bar?
How can you change the graph to make it more accurate?
What’s misleading about this graph?
It appears to be twice as tall
It looks like Hot Dogs are waaaaaaaaaay more popular than Pizza and Hamburgers.
The Hamburgers bar because about 7 of the Hamburgers bar would fit into the Hot Dogs Bar
Make the y-axis start at zero so the bars don’t look so stretched out.
Food
Votes
Pizza
972
Hot dogs
987
Hamburgers
955

10. A survey was taken to determine favorite food.
Same data!
Food
Votes
Pizza
972
Hot dogs
987
Hamburgers
955

11. It appears to be twice as tall
About how many times taller does Company Y’s bar appear to be than Company Z’s?
It appears to be twice as tall
How can you change the graph to make it more accurate?
What was the average salary for Company Y?
What was the average salary for Company Z?
What’s misleading about this graph?
$42,700
It looks like Company Y pays their employees a LOT more.
Make the y-axis start at zero
$41,800

12. the y-axis doesn’t start at zero the scale isn’t even
Line graphs can be misleading because…
the y-axis doesn’t start at zero
the scale isn’t even

13. At first glance, describe the state of San Francisco tourism.
Why might this graph be considered misleading?

14. The graph shows the amount of rainfall by year in a particular metropolitan area.
Explain why the graph is misleading.

15. CIRCLE GRAPHS The sectors don’t add up to 100%
Circle graphs can be misleading because…
The sectors don’t add up to 100%
25%
50%
The size of the sector and the percent don’t match.
12.5%
CIRCLE GRAPHS

16. The graph shows the allocation of the county budget for 2005.
Explain why the graph is misleading.

17. Why is this graph misleading?
Who might want to use the graph at right?

18. Who would want to use this graph?
Explain why the graph is misleading.
Who would want to use this graph?
Who should be really angry about this graph?

19. Why should consumers be concerned if they were buying this product?