Okay the first group test 51 guppies to find their survival rate on day 50
This is the control

The second group test 33 guppies to find their survival rate on day 50
This is the variable


Okay let us do the math...
A guppy in a population of 51 people represents 1.960784313725490196078431372549 percent of the survival rate.

a guppy in a population of 33 people represents 3.03030303030303 percent of the survival rate.


so am I the only one who sees a problem with using a different number of fish per experiment?

My parents say that I am wrong...
So am I?

and if so, what am I missing?

No this is taken from a table...
it is full of useless information that is organized horribly...

I am asking if I am right or wrong about the survival being different based on the number of fish

I think your right
1/33 = about 3 %
1/51 = about 2 %
so if 2 survive in the 33 fish test then 3 should survive in the 51 fish test for this to be correct. right ?

im kinda confused lol

you sort of have it...

I am saying that this difference causes an inaccuracy in data because if two out of 33 fish die it is a different percentage than if 2 out of 55 die

no you're wrong there, it wouldnt matter if you hade 100 fish, or 10 fish. It should be the percentage you want, wouldn't it ?

more fishy's eat more foods, and less fishy's eat less foods.

yeah i know that's a dumb answer LOL.

but atleast i didnt say

Quote:they can't hold their breath forever, they will run out of air!

yes the more the fish the higher their death rate is. Lets do extremes. 1 out of 5 fish die, and 1 out of 500 die. the rates are .20 or 20% and .002 or 2% percent. The same number of fish died but the rate changed because the total number is different. a controlled experiment should have the same variables nonetheless except for the manipulated variable, so even if they were the same rate, unless the number of fish is your manipulated variable, you should have the same number of fish.

Make sense?

MICk3Y Wrote:yes the more the fish the higher their death rate is. Lets do extremes. 1 out of 5 fish die, and 1 out of 500 die. the rates are .20 or 20% and .002 or 2% percent. The same number of fish died but the rate changed because the total number is different. a controlled experiment should have the same variables nonetheless except for the manipulated variable, so even if they were the same rate, unless the number of fish is your manipulated variable, you should have the same number of fish.

Make sense?

yes, thank you mick3y.
That is exactly what I am saying.