Exam 1 Core Answers

[nh4n]

WHAT THE HELL? a scatter plot does not have to show how one variable affects the other, we want it to.. thats why we make transformations. like is name, a "scatter" plot can be just a bunch of random points with no correlation what so ever. plus from my graph u can also see the breakdown, just count the amount of the repeated dots divided by the total number of dots, multiply by a 100, there u get ur %.
PLUS a segmented bar chart is not useless, it is used for "univariate" a method of showing information of 1 variable

[AhaShake]

Oh ok.
So that is why segmented bar charts are in the chapter 'Displaying and describing relationships between two variables'?
Of course! Because in my crazy maths book two means one!
How are you meant to count repeated dots? . how many does are in that full stop? I counted 15. How many do you count?

[nh4n]

you can have a key, or like in the exams, have the list of points above graph.  theres no point arguing with u, u just cant see that ur graph only shows one side. just study for tomorrow's exam and we will wait what the assessment report has to say
also in hienemen book segmented bar charts are under univariate

[AhaShake]

You cant see that your scatter plot shows absolutely nothing.
What did you get /40, out of interest?

[joechan521]

i see both of ur points
segmented bar chat only show the effect of iv on dv
whilst scatter plot graph only have 3x3 points, its impossible to interpret information from it, cos u'll have dots overlap.

the question asked it is "best displayed using "which graph?
i reckon segmented bar chat is a little better

[nh4n]

nothing wrong with overlapping points.
and if 10 is A, i would get 40/40 right
yourself?

[kjg]

wtf
10 cant be A
the text book clearly states that two categorical values = a segmented bar chart
this is crap
that means i can kiss a 30 goodbye

[*insert witty name here*]

hey guys,

been keeping up with your posts lol
the answer to question 10 should be E because
A- scatterplot
B- histogram
C- parallel boxplots
D- back- to- back stemplot
are used to display numerical data.

however, segmented bar charts can be constructed from a two-way frequency table- which is for categorical data. chapter four in further maths essential has an example on page 90 showing a segmented bar chart constructed from this two-way frequency table.

in relation to the question where the two variables are 'size of car' and 'salary level' car size is dependant on salary level and the segmented bar chart should depict the horizontal axis with salary level low, medium and high and the vertical axis should have the percentages of those with a car size small, medium or large.


hope that helps

[AhaShake]

There we go *insert witty name here* just backed everything me and others had been saying.
To nh4n, I got 40/40. Looks like you got 39 hey? Oh.

[Galelleo]

wow, someones grumpy.

learn to deal with exam stress imo

[nh4n]

There we go *insert witty name here* just backed everything me and others had been saying.
To nh4n, I got 40/40. Looks like you got 39 hey? Oh.

hey 39 is still great, plus we dont know who is right until the assessment reports come out. plus im happy with what a got for no studying all year, i have specialist to attend to. the question is very vague and no one can be absolutely sure, so we have to wait and see

[AhaShake]

haha grumpy?
yeh thats me. stress head. really stressed...

[joechan521]

itute had changed their solution regarding to that question
after consideration, the answer is E, like i said the question asked it is "best displayed using "which graph? and it appeared segmented bar chart is a bit better

NOTE: For Core Q10, the writer has chosen A because the writer believed that a regression line can be obtained if it exists and a r-value can then be determined. However in a scatterplot, points having the same numbers cannot be separated and appeared to be just one point, hence some information is lost. The requirement of the question is to best display (not determine) the relationship, thus it appears that E is the best answer

[AhaShake]

booyah.

[*insert witty name here*]

There we go *insert witty name here* just backed everything me and others had been saying.
To nh4n, I got 40/40. Looks like you got 39 hey? Oh.

hey 39 is still great, plus we dont know who is right until the assessment reports come out. plus im happy with what a got for no studying all year, i have specialist to attend to. the question is very vague and no one can be absolutely sure, so we have to wait and see

haha, that's hilarious. spesh child ^5
how'd you find the spesh exam...pretty straight forward wasn't? Although, EXAM 2 determines our marks booya