## 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

1. a)8
b)8
c)25
d.i)yes.It will still show the information clearly
d.ii)no.It will show the number of vehicles between the times even though the were not recorded down

2. 1) 8 heavy vehicles
2) 8 cars
3) 25 vehicles
4)i) yes...except that you cant include motorcycles and vans.
ii) no you cant the line graph does not serve this purpose it is used measure increase and decrease of the SAME thing

3. a)8 heavy vehicles
b)8 cars
c)25 vehicles
di)Yes, as the vehicles on the road can be depicted in percentage.
dii)No. Line graphs are plotted based on information collected over a period of time. The bar graph only have information at only one point of time.

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5. (a) 8
(b) 8
(c) 25
(d) (i) It is possible to present this in a pie chart becauseboth will be able to clearly show the number of vehicles.
(ii) It is not possible to present it in a line graph because a line graph is used to show data over a period of time but the information given is for a specific time.

6. a) 8
b) 8
c) 25
di) Yes, it can be represented by the pie chart
dii) No, the line graph can only be used when there are two factors against each other.

7. a) 8
b) 8
c) 25
d) i) yes , it is possible by using percentage or degrees
ii) no, it is impossible because line graph shows the satistics of something over a certain period of time.

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9. a) 8 heavy vehicles were observed at 7.05 am.
b)There are 8 more cars as compared to heavy vehicles at 7.05 am.
c)The total number of vehicles at 7.05 is 25.
d) i) Yes, it is possible to present this information using a pie chart. The pie chart is more catered for the use of presenting information where it measures the amount of certain things at a time.
ii) No, it is not possible as a line graph is more for measuring one item over a period of time.

10. a)8
b)8
c)25
d:
i) Yes. It shows the information clearly.
ii)No. It will show the number of vehicle between different times even though there were not recorded down.

11. (a) 8 heavy vehicles
(b) 8 more cars
(c) 25 vehicles
(d)(i) Yes, it can still show the number of vehicles
(d)(ii) No, it can only be used to show the difference between different vehicles.

12. (a) 8
(b) 7
(c) 25
(di)Yes.The pie chart will be able to show the number of vehicles using the chart.
(dii)No.The line graph records information over a period of time, whereas the graph here only shows the recording of one point of time.

13. a) Heavy Vehicles -8
b) 8
c) 25
d) i) Yes .The pie chart can show the values of the vehicles clearly
ii)No.A line graph is used to show the increase or decrease pattern of a single object

14. a) 8
b) 8
c) 25
d)
i) It is possible to present the information in a pie chart as it also shows and delivers the same message-showing the number of vehicles at the point of time
ii) It is not possible as a line graph is used to present data that shows a trend, not a definite time

15. (a) 8
(b) 8
(c) 25
(i) Yes, it is possible. It presents the information clearly.
(ii) No. Line graphs are used to show an amount changing over a period of time.

16. a)8
b)8
c)25
di) Yes, it is possible. It can show the graph clearly.
dii) No, it is not possible. Line graph is only used to measure something over a period of time.

17. a)8 heavy vehicles were observed at 7.05 a.m.
b)8
c)25
d)i)Yes,it will still show the information but in percentage.
ii)No, the line graph is more for measuring data over time

18. (a) 8 heavy vehicles were observed at 7.05am
(b) There are 8 more cars than heavy vehicles.
(c) There are 25 vehicles altogether at 7.05am
(d) Pie charts: No, it cannot. Pie charts cannot show that no motorcycles or vans were observed at 7.05am.
Line graph: No, it cannot. Line graphs are used to show the increase or decrease of something, if the object being tested is constant, it cannot be presented in a line graph.

19. (ii) Line Graph

a) 8
b) 8
c) 25
d) i) Yes. With the base 25, the number can be easily converted to percentage or degree.
ii) No. Line graphs are supposed to show something over a period of time but this is only in a specific time.
ii)

20. (a) 8
(b) 16 - 8 = 8
(c) 1 + 8 + 16 = 25
(d)(i) Yes. The pie chart will be able to clearly portray the data.
(ii)No. Line graphs are used to show the data collected over a period of time. Since the data was not collected over a period of time, the line graph cannot be used.

21. (a) 8
(b) 8
(c) 25
(d) (i) Yes, because the pie chart shows the number of vehicles in percentage which can be calculated to find out the actual number.
(ii) No, because a line graph shows the data over a period of time instead of just at one moment.

22. a)8
b)8
c)25
d)i)Yes.The pie chart will be able to show the details more clearly
ii)No.The information does not have a increase,decrease or constant.So the line graph would be inappropriate

23. (a) 8
(b) 8
(c) 25
(d)(i) Yes. The pie chart is able to show the number clearly.
(ii) No. The Line graph is used to show the increase and decrease in the number of a certain thing. But in this case, it is sowing the number of vehicles at a point of time. Hence, you cannot use the line graph.