Exam 1 Core Answers

[hifer]

My Answers
1. A
2. B
3. A
4. D
5. C
6. C
7. C
8. D
9. D
10. E
11. E
12. C
13. E

[maxleng]

got the same    

[Odette]

Here are my answers (i think i made like 2 mistakes :cry: )
Core-
1.A
2.B
3.A
4.D
5.C
6.C
7.C
8.D
9.A (Misread qn ahhh!)
10.B(Probably wrong )
11.E
12.C
13.E

[maxleng]

9 is D i put them in my calc twice using L1 as x and L3 as logy then do LinReg

10 is 2 categorical variables, which according to my book is segmented bar charts

[SilverBullet]

I got 4 wrong which is a fabulous result for me!!!!

[Defiler]

I got the same except for:

12. B
10. D

Someone explain where I went wrong on 12?

[Odette]

I got the same except for:

12. B
10. D

Someone explain where I went wrong on 12?

Well here's how i did it ...
Entered each point into the calculator, and used the med-med function (sure it's time consuming but you get a more accurate answer)

[maxleng]

I got the same except for:

12. B
10. D

Someone explain where I went wrong on 12?

12. did u divide it into 3 parts at each 12 month interval, then get the median of the 2 outer parts, draw a line between them

then i took rise/run

rise/run = (6000-4000)/(24-12)
            = 166.6667


LOL or do what odette said  :shock:


Q10. it cant be D,C,A cos they all involve numerical variables, we are only dealing with 2 categorical variables

[Timtasticle]

100% oooh yeah.

[kjg]

12) is C
cha ching

but i screwed up Q9) i know what i did wrong

i got 2 wrong in the core, cause im an idiot and didnt read the question properly

[Lyonzy]

I hated that qn 12! idiotic makin ya find the three med on a plot like that... i got 6.5 and 30.5 for the median x-values and 3000 and 7000 for y, getting C

[gangreen]

10 is 2 categorical variables, which according to my book is segmented bar charts

where in the book is that? i said a
can someone give a brief explanation of each of those 5 types?

[maxleng]

Essential maths page 109

[nh4n]

for Question 10, the answer should be A.. a scatter plot

As for the other solutions does not work
Histogram: univariate
back-to-back stem-leaf plot: compares categorical and numerical
parallel box plot: same thing as stem plot
"A" segmented percentage bar chart: segmented bar charts are univariate so with a single bar chart you cannot compare two variables

as each categorical notions are defined with a number, they can both be seen as 2 numerical data, hence allowing a scatter plot to be used

[gangreen]

for Question 10, the answer should be A.. a scatter plot

As for the other solutions does not work
Histogram: univariate
back-to-back stem-leaf plot: compares categorical and numerical
parallel box plot: same thing as stem plot
"A" segmented percentage bar chart: segmented bar charts are univariate so with a single bar chart you cannot compare two variables

as each categorical notions are defined with a number, they can both be seen as 2 numerical data, hence allowing a scatter plot to be used

thats what i thought *cough* i just looked at scatter plot and went yeah that would work and the others wouldnt, clearly i didnt think it through properly but yeah, thanks man