Further Math Exam 1: Answers + Discussion!

[Ethan.km]

Question 7 in business I got E anyone else?
Question 8 in networks I got D?
Question 9 in networks I got E?

[Dan1995]

Question 7 in business I got E anyone else?
Question 8 in networks I got D?
Question 9 in networks I got E?

How did you get those answers in networks?

[drewco.australia]

I believe in question 4 of the core, Postcode is potentially numerical. They do try and order post codes numerically, but I could also see the argument for categorical as well. It's a toughie and I think we just have to wait to see the Assessor's report

Question 6 in the core is B because Q1 is 30 and Q2 is 50, therefore the IQR is 20. 20*1.5 = 30, 40+30 is 70, so just before 70 is the upper outlier fence. There are 3 values above 70 and therefore 3 outliers. It could ONLY be B or E.

Question 8 in the core is D, not E. It can't possibly be E, as stem and leaf plots are for numerical variables only.

[Dan1995]

I believe in question 4 of the core, Postcode is potentially numerical. They do try and order post codes numerically, but I could also see the argument for categorical as well. It's a toughie and I think we just have to wait to see the Assessor's report

Question 6 in the core is B because Q1 is 30 and Q2 is 50, therefore the IQR is 20. 20*1.5 = 30, 40+30 is 70, so just before 70 is the upper outlier fence. There are 3 values above 70 and therefore 3 outliers. It could ONLY be B or E.

Question 8 in the core is D, not E. It can't possibly be E, as stem and leaf plots are for numerical variables only.

I agree the postcode one could go either way however I am much more convinced that it is categorical as it is less likely to be numerical as you cannot count or measure a postcode. It is the area you live in as defined by a number, therefore it is a numerical representation of a category.

You are correct except it should be 50+30 which equals 80 not 40+30. The answer is A.

Sorry but you are incorrect again here, a back-to-back stemplot shows the relationship between two categorical variables and a numerical variable, check your bivariate notes.

[drewco.australia]

I agree the postcode one could go either way however I am much more convinced that it is categorical as it is less likely to be numerical as you cannot count or measure a postcode. It is the area you live in as defined by a number, therefore it is a numerical representation of a category.

You are correct except it should be 50+30 which equals 80 not 40+30. The answer is A.

Sorry but you are incorrect again here, a back-to-back stemplot shows the relationship between two categorical variables and a numerical variable, check your bivariate notes.

I think you may be right about the postcode, but we'll see.

Oh yes, such a stupid mistake. I hate myself for that now -.-

I misinterpreted the question, but now I see that it's E. I was completely on the wrong track.

[skybluemaniac]

Does anyone have the paper? I'm interested into seeing what it look like this year. Thanks