Advantage: A line graph's advantages are that it is useful for comparing a set of data overtime. For example, your test scores for Math for a year. It is also good for finding a trend. A trend is a line of course or a pattern of events.
Disadvantage: The disadvantages of a line graph is that if the data is not exactly on an interval, the data is difficult to determine, and when you chart it the data is fairly inaccurate.
Advantage: The advantages of a bar graph is that it is very good for comparing data across categories.
Disadvantage: The disadvantages of a bar graph are similar to the line graph's disadvantages. When the data is not exactly on an interval, the data can easily be misinterpreted.
Advantage: The advantages of a pictograph is that it is useful for giving visual information, and it can be easily seen and interpreted with symbols.
Disadvantage: The disadvantages of a pictograph is that when the pictures are cut in small pieces, it is not very accurate or easily understood. For example, if you were to cut a picture in 1/3, it will look as if you cut it into halves.
Double Bar Graphs
Advantage: The advantages of a double bar graph is that it is good for comparing two sets of data across categories. That way you can see the comparison between two sets of data.
Disadvantages: The disadvantages of a double bar graph is that the data is hard to interpret if it is not precisely on the interval. A double bar graph is almost the same as a bar graph.
Advantage: It is best for comparing data by comparing to the whole using percentage.
Disadvantage: The disadvantages of a circle graph are that this graph is very difficult and time consuming to make, and if the data is placed into a category named 'Other', you would not know what to categorize that data in.
2. How can graphs be misleading. Show 3 ways.
A graph can be misleading if when you make it one bar wider;
You can put a break in the y-axis;
Or you can make different pictures in a pictograph larger than the other pictures.
2a) The following chart shows Pizza Sub Sales over a month. What 2 graphs would show the information accurately? A bar graph and a line graph.
2b) If you were selling Pizza Subs would you continue? How does your graph explain your answer.
I would continue selling Pizza Subs because the sales are going up, and the number of items sold are increasing.
4) Below you see 2 different examples of graphs showing healthy choices sold at the canteen. If you had to convince Mrs Mota that we should continue selling healthy choices which graph would you choose?
I would choose the line graph, because you can easily see the the sales becoming greater, and the trend is also easier to see.