2010 VCAA Experimental Design

[Christiano]

VCAA says the hypothesis is: Mice fed hard pellets will weigh more than mice that are fed soft pellets

I wrote that soft food pellets will result in more weight (since it states that less energy is retained when hard food is part of the diet).

Am I wrong? I don't understand why I'd be wrong, makes logical sense to me =\

[WhoTookMyUsername]

yeah, your hypothesis doesn't have to agree with VCAA, i put the same thing, a hypothesis is only a testable prediction.

It doesn't matter if you 'agree' or not, as your both trying to find evidence for different sides of the same argument.

[liuetenant]

omg, i did the same thing, hard food will result in more weight gain? i think it's the interpreting of the question, very confusing! :S
so does that mean my hypothesis was viable?

i hope that don't chuck something as confusing as that tomorrow!

[dou0014]

I wrote hypothesis the group of mice fed soft pellets will retain more energy and will put on more weight too! and we did that with the teacher.

And I also said the mice who ate soft pellets would weigh more. Now I'm confused

[dou0014]

I think I understand it now. If you retain more energy it means that it isn't converted to fat, so the ones that eat the hard pellets will weigh more. But that question is mean, I would have done the wrong thing under exam pressure

[Christiano]

I think I understand it now. If you retain more energy it means that it isn't converted to fat, so the ones that eat the hard pellets will weigh more. But that question is mean, I would have done the wrong thing under exam pressure

More energy retained = Energy stored in the form of fat?
'Retaining' means to keep the energy ..

[Charmz]

Personally I think that question was really stingey in terms of the marks awarded. It took a lot of time (for a question) and they only awarded 3 marks!?!

[BoredSatan]

imagine doing this in the exam.. Like us :idiot2: :uglystupid2: :idiot2: :uglystupid2:

[Truck]

YEAH, I said the exact same thing as you guys. But hypothesis doesn't matter in the end, so long as the exp. procedure = right, and you show how your results would support the hypothesis, still 3/3. But yeah, screw VCAA LOL.

[person]

In an experiment is the variable whats being kept constant or change? 

[Truck]

In an experiment is the variable whats being kept constant or change? 

A variable is essentially a factor in the experiment which can be changed. Independent Variable = being changed, Dependent variable = kept constant and you're measuring it, every other possible variable (i.e. temperature if you're not measuring/changing it) is still a variable but a constant one.

[person]

Why is a control neccessary?

and

What would a definition for aquired immunity be?

[Keo]

Why is a control neccessary?

and

What would a definition for aquired immunity be?

Control is needed to give a comparison if the treatment/experiment worked for example a mice that has a vaccine against influenza and one doesn't the mice with no vaccine would be the control as that mice should show symptoms of the disease in comparison the mice that took the vaccine showed no symptoms.

Immunity acquired by infection or vaccination (active immunity) or by the transfer of antibody or lymphocytes from an immune donor (passive immunity)

[slothpomba]

There was a list somewhere...maybe in A++ notes for experimental design questions like this. There might be a section in the text book on it...long as it covers a couple things such as it is falsifiable, you have a logical conclusion, ect things like that