Jemineth's scribepost for september 24 2009

Check Your Understanding

( question #6 )

6. For a science fair experiment, Mitchell

measured the height of a plant every

Monday for four weeks. He displayed the

data in a line graph and a pictograph.

a) What information does each graph provide ?

• Tally Chart
  
• Line Graph
• Pictograph

All of those graphs above give or show representation of the same data(s).

( How long the plant grows every week ) Each graph has its own way of showing the plants growth in which case, the Tally Chart shows the plants growth by a chart with the weeks number on one column, and the cm of the growth in the other column. The way that the Line Graph shows the growth over time is by placing the dot somewhere in the grid paper, which is measured by the area and the intervals, and connecting the dot to dot as time passes by. Finally , the pictograph shows the plants growth over time by pictures. The pictures will be given a specific value (eg. 10) and once provided that value you are responsible for getting the other answers by working with what you have (value).

b) Between which two weeks did the plant grow at the same rate ?

The plant grew at the same rate between the first week to the second week , and from the second week to the third week.

Why ? Because between those two weeks the growth rate both came up by 20's.

c) Between which two weeks did the plant grow most in height ? Which graph shows this more clearly ?

The plant grew the most between the third week to the fourth week. The graph that shows this clearly is that the line graph.

Why ? Because the line graph is best for showing changes over time. Which means the image given to you has lines, those lines are used to represent the data's . But the what's important is that hose lines weren't put there with no reason , they were placed there in a way that when you first look at the graph to solve questions that involve changes over times , those lines will quickly get your eyes attention.

d) Describe one advantage and one disadvantage of using each graph.

• Tally Chart

The advantage of using a tally chart is that its good for keeping information, and organization. The disadvantage of using a tally chart is that, when your doing a given work for solving things, its not the best and fastest way to get the answer.

• Line Graph

The advantage of using a line graph is that it is good for showing and representing data's that involve changes over time. Which makes it preferable the most for types of questions such as #6. A disadvantage of using a line graph is that, sometimes the dots that represent a specific value aren't accurate especially if the intervals are going from one small area on the grid paper to the other with large amounts of numbers . So in order to solve questions its either you try measuring with a ruler, or take a guess on what the value is.

• Pictograph

The advantage of using a pictograph is that when the pictures that are representing data are accurate to its value. It would be easy to work with and solve things. Another advantage is that a pictograph is also good in showing changes over time especially if values are accurate, but most people prefer a line graph because for them its easier to work with. A disadvantage of using a pictograph is that most of the times, the value of the pictures aren't accurate, so like the line graphs disadvantage its either you measure with a ruler, or take a guess.

This will be the end of my scribe post. Thank you :)

NOTE : That these things (questions ) can be seen @ www.mytextbook.ca for home works or for some other things .

PS. SORRY IF THERE WEREN'T MUCH OF PICTURES , AND NO VIDEO . HOPE YOU ENJOYED :)