00:01
In this question, we need to say which experiments have used the randomized comparative design.
00:08
So what this means, like, to have like this kind of design here? so to have a comparative, randomized comparative design, this means that we have to each experiment should have this.
00:25
Like, they should randomly in this case.
00:32
Assign the subjects or observations into the groups that they were testing.
00:40
So let's see which one of the experiments that we have here, that they have randomly assigned those into groups.
00:50
So in this case here, for the first one that we have here, they are saying that they were testing a new treatment, on fish in this case were in a polluted pond water and the key here they are saying that 60 fish with abnormal abrasions from the same pond were randomly placed into three groups so the key here is saying that they were like taking the 60 fish from this pound and they were like randomly assigning them into these three groups and then they will compare these groups so this first one met what we consider as a randomized comparative design.
01:38
Why is comparative? because as you can see in the end, we want to compare the groups that we have, the different groups.
01:46
And the randomize here is this here.
01:50
The sample that was collected was assigned to groups randomly.
01:57
Now, so the first one is, the second one is not one.
02:02
Because they are not assigning the customers into the three possible plans that they are comparing.
02:10
They are just like taking samples from each plan that they have to analyze, in this case, what they wanted.
02:24
In this case, like they gas bills over six months...