Methods Exam 1 2012 4c Official Verdict

[Uberjew]

But wouldn't it make sense to give at least 2/3 marks for 0.29 as the answer?

1 mark for getting the pairs correct and 1 consequential answer mark, since you followed through with your set up correctly to get what would've been a correct answer if not for conditional probability?

Though I'm still pretty pissed off that we're not getting 3/3 marks. How the hell were we supposed to know that it was conditional when they don't use any words like "given that" or "assuming that"? Obviously he's going to receive phone calls both days, otherwise it won't add to 4.

That's where I hope the examiner notes tell us but it would have been nice to hear what the assessors were talking about and what were their decisions...

[Special At Specialist]

But wouldn't it make sense to give at least 2/3 marks for 0.29 as the answer?

1 mark for getting the pairs correct and 1 consequential answer mark, since you followed through with your set up correctly to get what would've been a correct answer if not for conditional probability?

Though I'm still pretty pissed off that we're not getting 3/3 marks. How the hell were we supposed to know that it was conditional when they don't use any words like "given that" or "assuming that"? Obviously he's going to receive phone calls both days, otherwise it won't add to 4.

That's where I hope the examiner notes tell us but it would have been nice to hear what the assessors were talking about and what were their decisions...

The examiner's reports never tell us how the marking scheme works, unfortunately. We'll have to get a statement of marks.

[charmanderp]

But wouldn't it make sense to give at least 2/3 marks for 0.29 as the answer?

1 mark for getting the pairs correct and 1 consequential answer mark, since you followed through with your set up correctly to get what would've been a correct answer if not for conditional probability?

Though I'm still pretty pissed off that we're not getting 3/3 marks. How the hell were we supposed to know that it was conditional when they don't use any words like "given that" or "assuming that"? Obviously he's going to receive phone calls both days, otherwise it won't add to 4.

You've sort of contradicted yourself here.

[joseph95]

How the hell were we supposed to know that it was conditional when they don't use any words like "given that" or "assuming that"?

Quite a lot of people worked it out actually, including myself. The fact that it was out of 3 marks really gave it away for me.

[Special At Specialist]

But wouldn't it make sense to give at least 2/3 marks for 0.29 as the answer?

1 mark for getting the pairs correct and 1 consequential answer mark, since you followed through with your set up correctly to get what would've been a correct answer if not for conditional probability?

Though I'm still pretty pissed off that we're not getting 3/3 marks. How the hell were we supposed to know that it was conditional when they don't use any words like "given that" or "assuming that"? Obviously he's going to receive phone calls both days, otherwise it won't add to 4.

You've sort of contradicted yourself here.

How did I contradict myself? There is no way for it to add to 4 without receiving phone calls on both days, so I just calculated Pr(1, 3) + Pr(2, 2) + Pr(3, 1), without letting zero be an option. The way I worked it out takes into account the fact that it can't be zero. Look over my work. Where do I assume that the probability can equal zero? Nowhere! I only calculated values for 1, 2 and 3. There is no contradiction involved.

It could have AT LEAST said something like "he receives at least one phone call on each day" if it didn't want to add words like "given that" or "assuming that".

Quite a lot of people worked it out actually, including myself. The fact that it was out of 3 marks really gave it away for me.

You didn't work shit out. You took a fucking guess. There is no way to "work out" the answer to an ambiguous question without a mind-reading device. I hate it when maths questions do this! The reason I don't do English is because I can't stand it when an answer or essay is open to an opinion. I like it when there is ONE ANSWER and ALL LOGICAL METHODS arrive at that one answer. That is what true maths is about, not this bullshit.

[TrueTears]

I like it when there is ONE ANSWER and ALL LOGICAL METHODS arrive at that one answer. That is what true maths is about, not this bullshit.

Some of the most open problems in mathematics do not have one answer, there are often an abundance of answers, depending on the interpretation.

However in high school mathematics I agree, that question was badly worded, they should have worded it clearer to imply a conditional event.

[joseph95]

You didn't work shit out. You took a fucking guess. There is no way to "work out" the answer to an ambiguous question without a mind-reading device. I hate it when maths questions do this! The reason I don't do English is because I can't stand it when an answer or essay is open to an opinion. I like it when there is ONE ANSWER and ALL LOGICAL METHODS arrive at that one answer. That is what true maths is about, not this bullshit.

That's true, it did rely on some sort of reading comprehension and should not have been there. But it was. And a lot of people got it right, and there's no reason to hate them for that. Relax a bit there's nothing you can do to change it now.

[BubbleWrapMan]

Where do I assume that the probability can equal zero? Nowhere! I only calculated values for 1, 2 and 3. There is no contradiction involved.

You assume it by using the original sample space to calculate the probabilities, which includes zero.

Also, don't write it off as a fluke that other people understood the question, it's a little insulting. Not to mention the swearing.

[FlorianK]

But wouldn't it make sense to give at least 2/3 marks for 0.29 as the answer?

1 mark for getting the pairs correct and 1 consequential answer mark, since you followed through with your set up correctly to get what would've been a correct answer if not for conditional probability?

Though I'm still pretty pissed off that we're not getting 3/3 marks. How the hell were we supposed to know that it was conditional when they don't use any words like "given that" or "assuming that"? Obviously he's going to receive phone calls both days, otherwise it won't add to 4.

you are getting 2/3
1Mark for choosing the right pairs
1Mark for evaluating

you just don't get the mark for using conditional probability