### Chap 16 Data Handling (Lesson 1) Worksheet 16.1 Q3

The following shows 2 sets of charts representing the traffic condition at 7.00 am and 7.35 am: Bar Charts and Pie Charts.

• At what time is the road more congested - 7.00 am or 7.35 am?
• Which type of chart (Bar Chart or Pie Chart) would be more appropriate/ a better choice to inform us the above at what time the road is more conjested? Why?

1. 7.35 am

Bar chart. It is easier and quicker for us to compare the numbers by looking at the length.

2. a. 7.35 am
b. Bar chart. It represents data in a way that immediately after seeing it, you have a rough idea of what is the quantity of the items whereas for a pie chart, you need to count the numbers individually before knowing the quantity of the iems.

3. i) 1+1+2+14 = 18
33+3+1+7+4=48
Ans= 7.35 am

ii) Bar chart as it shows which bar is longer and it is easier to see the which is more congested.

4. 7.35a.m.
Bar Chart. As the pie chart always present 100%, the number of vehicles does not matter. To see the difference in the number of cars, I can see it at a glance from the bar chart.

5. 1. 7.35 am
2. Using a bar graph is better as it is clearer to see the total number of vehicles more clearly. In a pie chart, 1/4 can mean any digit. 1/4 in one pie chart can be compared as 1/2 in another, so it is hard to visualize the information.

6. 7.35am.
Bar Chart. It displays the data clearly.
When using a Pie Chart, it is not as clear as all the numbers will always form a pie not matter how big.

7. This comment has been removed by the author.

8. 7.35am

Bar Chart. The information is neater and more organised so it will be easier to count the number of vehicles.

9. 7.35am
Bar chart as the pie chart will just present 100% no matter of the number of cars. It is easier to know the number of vehicles by just looking at the length.

10. 7.35 am
Bar chart since the number of vehicles is easy to compare this making it easier to do the task

11. 7.35 am

Bar Chart. It can also show the timing of when the vehicle passed, and it is also easier for me to compare.

12. 7.35am

bar chart.
The bar chart shows significant differences but the pie chart only show the difference in angles, which is harder to see without the numbers there.

13. -7.35 am
-Both ways are good for informing us what time the road is more congested but bar graph would be clearer and easier to see which time the road is more congested.

14. The road is more congested on 7.35am. I think Bar Charts would be a more appropriate source to inform us the above at what time the road is more congested; this may be due to a clearer presentation to compare and contrast the data.

15. - The road is more congested at 7.25 am

- Bar chart, because we can see the difference of length of the bar charts easily. The pie chart is in a fixed size, thus they only can represent the difference by stating the number in the area of the chart. Because of that, i think that the bar chart is more suitable to inform us at what time the road is more congested.

16. (a) 7.35am
(b) The bar chart would be more appropriate, as the number of vehicles can be seen more clearly from the bar chart, while the pie chart shows a whole pie and the total number of vehicles must be calculated before the results can be shown. However, through the length of the vars in the bar charts, it is obvious at what time the roads are more congested.

17. 7.35am

I think Bar Chart is better than Pie Chart because the data is displayed more organised in the Bar Chart and that enables us to be able to see the difference between the number of cars at 7.05am and 7.35am immediately.

18. a) 7.35 am
b) Bar chart. It is easier to compare the numbers between the different vehicles in a bar chart.

19. a. 7.35am

b. Bar chart. It is easier for us to compare and analyze.

20. (a) 7.35 pm
(b) Bar chart. It is easier for us to indicate what time is more congested.

21. 7.35 am

bar graph as pie charts are according to 100% and it does not indicate the number of vehicles.the bar graph shows the numbers more clearly

22. To all:

While all of us agreed that bar chart is a better choice of visual representation, how would the PIE Chart be helpful to us? What kind of information does the pie chart provide?

23. 7.35 am

The bar graph is easier to use

The pie chart can help us when the number of vehicles for both timing is the same

24. pie chart enables us to calculate percentage or fraction easier as the numbers are already written. as for the bar chart, we still have to relate the tip of the bar to the numbers provided. (very 麻烦 lor haha)

25. When given 2 pie charts that present the types of vehicles at different timing, how is this information going to be useful?