Core data Sac question

[mrb3n]

Hey guys,

I'm currently doing the core data analysis SAC in class and I came across a question which stumped me a bit. The question is in two parts and goes something like so:

a) draw a 3-median line for a set of data data

b) why would a 3-median regression line be more suitable for this data?

I drew the 3-median line without any hassle but I don't really understand why a 3-median regression would be better. I'm fairly certain both methods are suitable if the data have outliers and I can't think of any other reason as to why.

Cn someone help me?

[tcstudent]

may be wrong but i wrote for that question i had on my sac, 3 median line is not affected by outliers.

[jeanweasley]

may be wrong but i wrote for that question i had on my sac, 3 median line is not affected by outliers.

Yeah, this, and it's because the least squares regression line is affected by outliers so it would be better to use 3 median line. (this is an explanation not the answer)

[Yacoubb]

Hey guys,

I'm currently doing the core data analysis SAC in class and I came across a question which stumped me a bit. The question is in two parts and goes something like so:

a) draw a 3-median line for a set of data data

b) why would a 3-median regression line be more suitable for this data?

I drew the 3-median line without any hassle but I don't really understand why a 3-median regression would be better. I'm fairly certain both methods are suitable if the data have outliers and I can't think of any other reason as to why.

Cn someone help me?

While the least squares regression line is affected by outliers, the three-median regression line is not affected by outlying values. Therefore, because of the presence of outliers in the data set, the three-median line will be more suitable.

[Cynthia]

Hey guys,
I am new to this so sorry if I have posted this in the wrong area :S
I was just wondering if any of you have the solutions to the 2008 Further Maths Exam 1 Insight exam?
I would love to know what you get for the core questions (Q1-13), here is the link to the exam:
http://mathsfmmm.edublogs.org/files/2009/10/Further-Mathematics-1-Exam-2008-Questions.pdf
Thanks.

[brenden]

It's against the rules for anyone to provide a set of answers for the exam because of copyright law. If they didn't want to get banned, I guess they'd have to send it to you in a pm and no one would ever know, but that would also be illegal, and breaking the law is wrong, kids.

[brenden]

^ Question 8 would be B.

Yeah I couldn't remember how to do it with medians for shit LOL

[jeanweasley]

I think I found the solutions: http://mathsfmmm.edublogs.org/files/2009/10/Further_Mathematics_1_Exam-solutions-insight.pdf

[brenden]

You should probably read this post Re: Core data Sac question

[lala1911]

Yeah I couldn't remember how to do it with medians for shit LOL

Using 4 point MEDIANS, I used the mean, I should learn to read the questions better

[brenden]

Using 4 point MEDIANS, I used the mean, I should learn to read the questions better

HAHAHAHAHA - definitely something you'll want to learn before the exam ;p


Edit: That's okay, I removed my answers because I made too many very, very silly rookie errors ;p