VCE Specialist 3/4 Question Thread!

[HakunaMattata]

Hey everyone!
Stuck on this question 
(I attached a picture of it)

Thanks in advance! 

[Imtryingtostudy]

How can you use an Estimator or B given B is a real statistic from the overall population, and its multiplied by parameter p,
 such that E(B) =p

How can you use this formula to show why results are biased or not?

[Rumena]

Just a quick question, if you get 90% in all 3 sacs and get a B+ in exam 1 and a B in exam 2, what study score are you roughly heading for?

[Callum@1373]

Hey, if anyone has the 2016 MAV specialist exam 2 could you please send it to me via p.m?

[Callum@1373]

Hey, if anyone has the 2016 MAV specialist exam 2 could you please send it to me via p.m?

Anyone?

[n.a]

Hey guys,

So this question has to do with a simple pulley system.

There is a mass of 10kg on the left of the pulley and an unknown mass on the other side. Question is what is the  force required to raise the 10kg mass at 0.2 m per sec. No acceleration.

Thanks. 😊

[zsteve]

Hey guys,

So this question has to do with a simple pulley system.

There is a mass of 10kg on the left of the pulley and an unknown mass on the other side. Question is what is the  force required to raise the 10kg mass at 0.2 m per sec. No acceleration.

Thanks. 😊

We really don't have enough information to solve this problem EXCEPT for the special case where the other mass is also 10kg (in which case zero force is required).

In any other case, we'll need to know the other mass.

[Sine]

If you make a mistake on an integration question and consequently end up with the incorrect answer do you lose 2 marks, 1 for the error and 1 for not getting the answer mark or do you only lose 1 mark. (Assume Tech free exam)

[blacksanta62]

How would I do this question?

PB!

Thank you

[RuiAce]

How would I do this question?

PB!

Thank you

[blacksanta62]

Thanks Rui Makes sense now

[NerdyPi]

Hi guys, so for part iii, q5 of exam 2 2012, they ask for the distance for speedboat to come to rest. I got the same answer as examiners report (18.8m), but I worked it out using a = v * dv/dx, whereas the answer uses the velocity (from part ii of question) to find this. Would I still get full marks if the answer was exactly the same and my method was still correct? If not, how many marks would I get out of 3? (Surely at least one for correct answer?) They are quite vague about it in the comments on report
"This question was generally done well by those students who completed the paper up to this last stage. One error, though not common, was the use of constant acceleration formulas for this part."

Thanks

[zsteve]

Hi guys, so for part iii, q5 of exam 2 2012, they ask for the distance for speedboat to come to rest. I got the same answer as examiners report (18.8m), but I worked it out using a = v * dv/dx, whereas the answer uses the velocity (from part ii of question) to find this. Would I still get full marks if the answer was exactly the same and my method was still correct? If not, how many marks would I get out of 3? (Surely at least one for correct answer?) They are quite vague about it in the comments on report
"This question was generally done well by those students who completed the paper up to this last stage. One error, though not common, was the use of constant acceleration formulas for this part."

Thanks

Unless the question explicitly specified that you needed to use the previous result, no-one cares. As long as your method is legit and your answer is right, you can expect full marks unless you've stuffed up something like notation.

[Wyrden]

When do we use a two tail test instead of a one tail test in any stat questions?

[zsteve]

When do we use a two tail test instead of a one tail test in any stat questions?

We use a two-tail test when any potential trends behind our data are non-directional. That is when, in your alternate hypothesis, you can't specify that \(\mu < \mu_0\) or \(\mu > \mu_0\), but only that \(\mu \ne \mu_0\).

For instance, if I were studying the effect of tuition on VCE study scores, my null hypothesis would be \( \mu = 30\) (no effect), and alternate would be \( \mu > 30\) (positive effect). Here, we have a directional change, and we use a one-tail test.

However, say a coffee machine needs to dispense 30mL of concentrated coffee if it works properly. If we're testing for machine faults, we don't know if the machine will product too much or too little coffee.
Hence, our null hypothesis would be \( \mu = 30\) (no change, working properly), but alternate would be \(\mu \ne 30\) (some change up or down so it's broken)

You need to be acutely aware of the context of a question to make sure you get this right!