## Tuesday, March 29, 2011

### Data Handling (Bar Chart)

BAR CHART
source: Worksheet 16.1 Q1

The bar chart above shows the traffic condition outside SST at 7.05 in a typical morning.
(a) Find the number of heavy vehicles observed at 7.05 am
(b) How many more cars are there as compared to heavy vehicles at 7.05 am?
(c) What is the total number of vehicles on the road at 7.05 am?
(d) Is it possible to present the above information using the following charts? Justify your answers.
(i)   Pie Chart
(ii)  Line Graph

courtesy of Ms Loh KY

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2. (a) 8
(b) 8
(c) 25
(d) A bar graph is a chart represented by rectangular bars with lengths proportional to the values that they represent.
(i) It is able to present the information from the bar graph to the pie chart, because both graphs show the quantities and we can compare them.
(ii) It is also able to present the information from the bar graph to the line graph, because both graphs also show the quantities and we can compare them too.

3. a) 8
b) 8
c) 25
d) Yes. The pie chart will show the 'percentage' of the cars on the roads while the line graph shows the 'increase/decrease' in the number of vehicles.

4. (a) 8
(b) 8 more cars then heavy vehicles
(c) 25
(d)(i) Yes, as a pie chart can be used to compile different information like that in the bar graph.
(ii) No, as a line graph is plotted to present an increase by increase.

5. a)8
b)8
c)25
i) You can represent it in a pie chart as it would represent the multiple quantities in the form of percentage.
ii)You can present it in a line graph but the line graph would not have any inclines or declines as the data is presented without data at multiple times.

6. (a) 8
(b) 8
(c) 25
(d) i) It is possible to present the information in pie chart as the information can be seen and articulated.
ii) The data should not be presented in the line graph as a line graph shows the gradual increase in time.

7. a) 8
b) 8
c) 25
d) yes. both charts can show the amount of vehicles

8. a) 8
b) 8
c) 25
di) Yes. It is because the pie chart can present information equivalent to the bar graph, except the pattern of the pie chart.
dii) No. It is because the line graph shows the increase and decrease of the the vehicles without showing the exact amount at that point of time.

9. a]8
a]8
c]25
d]yes
i]all graphs are compatible with each other as long as there is numbers.
ii]all graphs are compatible with each other as long as there is numbers.

10. a) 8
b) 8
c) 25
d)
i)You cannot use the pie charts as you cannot show some of the types of vehicles there are if the number of the vehicles are 0.
ii)You can use the line graph as u will list all the types of vehicles and it is also able to show the information.

11. a) 8
b) 8
c) 25
d) (i)yes it can be displayed using pie graph.using the bar graph is the same as the pie graph
(ii) no, it will not be accurate as the start of the graph always starts from 0

12. a) 8
b) 8
c) 25
d) (i) Yes. The pie chart show the number of the cars on the roads while the line graph show the flow in the number of vehicles at different intervals

13. a) 8
b) 8
c) 25
d)
(i) yes. As pie graph is also used for comparison, so it is suitable to present the information with the bar graph.
(ii)No. The line graph is mostly not used for comparison as it stats from zero which does not makes sense as there is always cars on the road.

14. a) 8
b) 8
c) 25
d) Yes it will. The pie chart will display the statistics in percentage. The line graph will show the difference.

15. a) 8 heavy vehicles
b) 8 more cars
c) 25 vehicles
d) It is possible to show the data in both pie chart and line graph. But it will not advisable to use line graph as it shows the increasement and decreasement of something.

16. a)8
b)8
c)25
d)
i) yes, it is because the vehicles can be shown individually yet can be compared
ii) no, because the varibles would be compared wrongly.