Wednesday, September 30, 2009
1. a) He wants to make a distorted graph that will show a great improvement in his quiz?
Answer: This graph shows the great improvement because the large distance in the y-axis that is why it is called distorted.
1.b) Draw a new graph that display the data more accurately ?
Answer: It shows accuracy because of large distance based on the x-axis
1.c) How are the two graphs different ?
Answer: The differ from distances that they occupy
9. The two graphs show the number of
health bars sold by two students.
a) How are the two graphs different?
b) For each graph, what conclusion would
you make about health bar sales?
c) Which graph gives a more accurate
comparison of sales ? explain
A) The graph A, the numbers go up by 2o s while in
Graph B, the numbers go up by 100 s
B) There 's not much differences b/w the two
Graph A is just 5% less than GRAPH B
C) Graph A because it starts from a lower number and
pattern's not that hard ti find out
a) Explain how this graph could be misleading. This graph is misleading because Scott's bar is more wide than Bryce's and there is a break in the X-axis.
b) What conclusion does the graph suggest about Scott's progress compared with Bryce's progress? Scott's progress looks far more ahead of Bryce's but, its only 1 more interval then Bryce.
c) Describe how to redraw the graph to represent the data more accurately. I would make the bars equal in size, I would take away the break in the X-axis and shorten the graph to make it less misleading.
Note: I forgot how to get pictures from mytextbook.ca.
6. a. From the pictograph, which fruit seems
to sell the best? Explain.
- Apples seems to sell the best, cause the size of the fruits are diffrent than other.
b. Does it seem that more cherries were
sold or more peaches? Explain.
- There more peaches sold than cherries, cherries only sold 90kg and peaches sold 100kg.
c. How should the pictograph be redrawn
to represent the data more accurately?
- Pictograph can be represent the data more accurately is by using the same size on all the fruits.
Note: please comment on anything i missed or typos. Thanks
Sorry that there no picture. i forgot how to put the picture on mytextbook.ca on here
The grade 8 students voted on where
to hold their year-end party. The results
of the vote were presented in this graph.
a) Based on the graph, how many times more popular was the beach than the pool?
For my answer, I put that the beach had 25 more votes
than the pool.
b) Leah concluded that the majority of the students
want to go to the beach. Is she correct? Explain.
In my opinion Leah is correct because
the graph shows that the beach has the most votes.
c) Draw a new graph to represent the data more accurately.
I chose the circle graph to represent
the data more accurately.
13 a) The 2 circle graphs are meant to represent the same information.
Does it appear that way? Explain
Answer: It does not appear that way because the shapes from D and C are different.
B) Identify the errors in graph A.
Answers: D is to large and C is too small.
This is my scribe for question # 18 .
Grade 8 students were surveyed about their weekly use of a computer.
Time Daily/ 2 to 6 days /Less than 2 days
Frequency/12 /20/ 8
Draw a diagram to support an argument that Grade 8 students are not using the computer too often .
( i could not apply my diagram on the computer so i guess ill just explain my thoughts about the question )
My thoughts on this question are , that the students don't use it too often because 20 students said that they use the computer between 2 - 6 days and only 8 said that they use it in less than 6 days . Students should use the computer almost everyday.
Thank you ! for reading this post . P.S. sorry no pictures .
Tuesday, September 29, 2009
- Tally Chart
- Line Graph
- Tally Chart
- Line Graph
PS. SORRY IF THERE WEREN'T MUCH OF PICTURES , AND NO VIDEO . HOPE YOU ENJOYED :)
The election results for student council president were displayed in a bar graph.
a) Bar B is 4 squares taller than Bar A.
b)B has 100 more votes than A.
c)At first it's low and then goes up then back down.
d)It could have been redrawn as a circle graph to make it easier to read.
Video on Bar Graphs
Sorry I dont have any pictures. I seem to forgotten my password or username for mytextbook.ca. :(
a) Explain how this graphy could be misleading.
I think this graph is misleading because from a distance, it looks like there's a big difference in the temperature when there isn't really.
b) What conclusions does the graph suggest about the changes in the temperature?
Um, it concludes that there isn't much of a change in the day's temperature. But the way the graph is written makes it seem that there are big changes in the temperature.
c) How should the graph be redrawn to make the data clearer ?
Maybe if the intervals were labelled in the right way, then the graph wouldn't look so bad.
Monday, September 28, 2009
favourite flavour of ice cream. What
information is missing on the graph?
a) How would you make a bar graph to help agree that travis spends most of time sleeping or going to school?
- I would use a pi graph because we need to compare the datas . Travis spends more time sleeping.
b) How would you make a bar graph that Travis could use to argue that he spends almost as much time on homework as he does at school?
- I would use a bar graph . Travis spends more time at school.
The table shows the decibel levels of different sounds in the environment.
a) Use a bar graph to display the data. What is one advantage of using a bar graph?
A bar graph shows an comparison of sound levels.
b) Could you use a line graph to display that data?
No, Because the data are not a comparison over a period of time, a line graph would not be a good choice of graph.
c) Could you use a circle graph to display the data? Explain.
A pictograph could be used, but it would not be as good as a bar graph because of the fractions of pictures need to represent these data.
1. Distorting the scale.
2. Distorting visuals
3. Distorting the size of bars
Sunday, September 27, 2009
The table shows the heights of two friends
measured over time.
a) Use a double bar graph and a double line graph to display the data.
b) How are the trends for Andrea and Lewis similar? How are they different?
Answer: The trends are the same in the the heights cause they both are increasing from ages 2 to 14. The trends are different by Andrea stopping at the age of 14 and Lewis is still growing at the age of 14.
c) Would two circle graphs be effective for displaying the data? Explain why or why not.
Answer: No, because the heights aren't a part of a whole so the circle graph would not be a good idea to use.
Friday, September 25, 2009
What we did in class today is we move on to the next section of Chapter 1, and the title is Misrepresenting Data.
Believe it or not some people may misinterpret data and draw false conclusions when graphs are misleading.
Misleading features of graph may include the following:
1. Distorting the scale
2. Distorting the information by using visuals of different sizes
Page 20: Show You Know
a) Explain how this graph could be misleading.
b) What conclusion does the graph suggest about the price of gas at the end of the day compared with the price at the beginning of the day?
c) Describe how to redraw the graph to represent the data more accurately.
a) Explain how this graph could be misleading?
b) What conclusion does the graph suggest about favorite lunch specials?
c) How could you redraw the graph to display it more accurately?
Here's a video I made. Hope you like it! (:
Thanks for viewing my scribe. (:
Thursday, September 24, 2009
a) What information does each graph provide?
The circle graph shows the percent of the time all three girls used the piano. The bar graph shows the number of hours the girls used the piano.
What is the lowest number or hours played and who's the one it represents? Answer: The lowest number of hours played is 10 hours by Sara.
Monday, September 7, 2009
A Colleague of mine Mr. Kuropatwa created this post for his students. Since it is Internet Safety Week please pay attention to the videos below.
Blogging is a very public activity. Anything that gets posted on the internet stays there. Forever. Deleting a post simply removes it from the blog it was posted to. Copies of the post may exist scattered all over the internet. I have come across posts from my students on blogs as far away as Sweden! That is why we are being so careful to respect your privacy and using first names only. We do not use pictures of ourselves. If you really want a graphic image associated with your posting use an avatar -- a picture of something that represents you but IS NOT of you.
Here are a few videos that illustrate some of what I want you to think about:
Two teachers in the U.S.A. worked with their classes to come up with a list of guidelines for student bloggers.
One of them, Bud Hunt, has these suggestions, among others:
- Students using blogs are expected to treat blogspaces as classroom spaces. Speech that is inappropriate for class is not appropriate for our blog. While we encourage you to engage in debate and conversation with other bloggers, we also expect that you will conduct yourself in a manner reflective of a representative of this school.
- Never EVER EVER give out or record personal information on our blog. Our blog exists as a public space on the Internet. Don’t share anything that you don’t want the world to know. For your safety, be careful what you say, too. Don’t give out your phone number or home address. This is particularly important to remember if you have a personal online journal or blog elsewhere.
- Again, your blog is a public space. And if you put it on the Internet, odds are really good that it will stay on the Internet. Always. That means ten years from now when you are looking for a job, it might be possible for an employer to discover some really hateful and immature things you said when you were younger and more prone to foolish things. Be sure that anything you write you are proud of. It can come back to haunt you if you don’t.
- Never link to something you haven’t read. While it isn’t your job to police the Internet, when you link to something, you should make sure it is something that you really want to be associated with. If a link contains material that might be creepy or make some people uncomfortable, you should probably try a different source.
Another teacher, Steve Lazar, developed a set of guidelines in consultation with his students. You can read them here.
Look over the guidelines and add the ones you like in the comments section below this post; either from one of Steve's students or one of your own. I think Bud's suggestions are excellent. We'll be using the one's I highlighted above as a basis for how we will use our blog.
I could not have written it any better. Enjoy blogging and use your head. Thanks