## 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
edited by Mr Johari

1. a) 8
b) 8
c) 25
d) It is possible for a pie chart but not for line graph as they do not cover the vehicles passing by over time. The information should only be present for the types of vehicles at 7.05 am.

2. a) 8
b) 8
c) 25
d) Yes, it is possible. As the number are like 1,2 and so on that does not have fraction or decimal. The time did not change so it would be more easier

3. a) 8
b) 8
c) 25
d) (i) Yes. Pie Charts can represent the percentage of how many of the total vehicles on the road at the certain time.
(ii) No. Line Graphs are used to represent the progress of a certain period of time, not the percentage or number of vehicles at a certain time.

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6. a) 8
b) 8
c) 25
d) i)Yes to is possible to use the image to represent
ii)no. it is not a continuous time so cannot

7. a) There were 8 heavy vehicles
b) There were 8 more cars than heavy vehicles
c) The total number of vehicles spotted at 7.05 am is 25
d) Pie chart: Yes it is possible as pie chart can show the number of a particular set of vehicles over the total amount of vehicles
Line graph: no it is not possible as line graphs show changes in the amount of vehicles over time but this information only shows the amount of vehicles at the same time.

8. a. 8
b. 8
c. 25
d. For a pie chart it is possible, but for a line graph, it is not. A line graph would only be able to show the amount of vehicles/traffic over a period of time.

9. a) 8
b) 8
c) 25
d i) it is possible to use a pie chart, as we can express the amount of vehicles in percentage. It also looks more attractive.
d ii) Line graphs are best used to measure how amounts change with time. The vehicles are only counted at 7.05am, which means the time does not change, and thus we cannot use a line graph.

10. a)8
b)8
c)25
d)The pie char is possible but for the line graph, you must have multiple graphs.

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12. a)8
b)8
c)25
d)It is possible. It is because the numbers are small and whole hence they can be represented in bar charts. Pie chart is possible. But line graph is not applicable as it is not showing a period of time

13. a)8
b)8
c)25
d)It is possible for a pie chart but not the line graph as the line graph is for over a period of time.

14. a)8
b)8
c)25
d)It is possible to use pie chart for this while line graph is not as line graph is used to present information over a period of time.

15. a)8
b)8
c)25
d(i) Yes. We can express the numbers in percentages.
ii) No as we are not showing the increase of vehicles during a period of time but the number during a certain time.

16. 1)8
2)8
3)25
4)It is possible to use a pie chart, but the line graph is for measuring something over a period of time.

17. a) 8
b) 8
c) 25
d) I think it is possible to cover vehicles passing by over time using pie charts as line graphs are used only for a period of time.

18. a) 8
b) 8
c) 25
d)
i ) Yes, you can represent the number of vehicles passing.
ii) No, you can only represent a object over a period over time.

19. a) There are 8 heavy vehicles.

b) Cars = 16
Heavy Vehicles = 8
Difference = 16 - 8 = 8
There are 8 more cars than heavy vehicles.

c) Bus = 1
Heavy Vehicle = 8
Cars = 16
Total = 1 + 8 + 16 = 25
There are 25 vehicles in total.

d)(i) Yes, you can represent the information in a Pie Chart.
d)(ii) No, you cannot represent the information in a Line Graph as there may be different vehicles arriving at the same time so it is not possible to express that in a line graph unless each vehicle type has an individual line graph to show the amount of that particular vehicles during that particular time.

20. a) 8
b) 8
c) 25
d)(i)The information can be recorded in a Pie Chart.
d)(ii)The Line Graph cannot record the information because it is only used to calculate how many vehicles over a period of time.

21. a. 8
b. 8
c. 25
d.i) Yes. The pie chart can be used to present the information above as it can show the difference number of each types of vehicle at a glance and as the time does not change, it is only at 7.05 am.
ii) No. Line graphs oftenly or almost only used to present informations when they contain informations taken at different periods of time. In fact this record only shows vehicles taken over only a period of time, at 7.05 am, therefore the line graph is not valid for being used to present the data.

22. a)8
b)8
c)25
d(i)It is possible to represent it in a pie chart as it only shows the number of cars at 7.05 am and not throughout the day.
(ii)No.Line graphs are only used to calculate things over a period of time and not only at 7.05 am only.