Question

Please help!!! I will medal and fan :)

Answer 1

2 more questions to this please help!

Answer 2

Which one do you think it is?

Answer 3

What was always the same in experiment even when another variable changed.

Answer 4

I'm thinking C, I'm not really good with science.

Answer 5

The control something that isn't changed

Answer 6

they're testing the effects of cleaner on the growth of mildew. so think.. they use two cleaners, and they want to test the effectiveness of each, how would they know how effective they are if they didn't have a third group where no clearer is used?

Answer 7

so you need to think about what was kept constant in this experiment in terms of the control @sunflow1

Answer 8

Okay, so I think Brand X was kept constant because it was good for 3 days.

Answer 9

hmm. if i'm correct the the numbers correspond to the area as in the growth of mildew
so for brand X you can see that for three days the mildew is virtually non-existent it's zero. but for brand Y there are values for three of the days so which one would be more effective?

Answer 10

Uhh Barnd Y... @Photon336

Answer 11

@sunflow1 think of it this way.

the purpose of this experiment is that you want to see which brand is more effective at killing mildew.

the brand that's more effective at killing mildew will be the one that has the lowest area in growth mm

follow?

Answer 12

Yes. Sorry if I'm frustrating you.

Answer 13

no you're not; it's probably that I'm not explaining it clear enough

Answer 14

so we can see that BRAND X is the better cleaner than BRAND Y because the area in mm for the mildew for brand X is much less

Answer 15

Yes.

Answer 16

(note they said something else): " they made sure that they did the experiment on the same tiles"

Answer 17

yeah

Answer 18

why is this important?

Answer 19

It's Important because they want to make sure they are testing it right...im not sure.

Answer 20

yeah.. that's correct ( because if they used different tiles) then the mold might grow faster or slower depending on the tile and they want to make sure that they are testing it correctly/

Answer 21

so would that be our control?

Answer 22

Wait is a control a factor in an experiment that remains the same

Answer 23

yes that is correct

Answer 24

so that means it would be C

Answer 25

yeah that makes most sense to me

the four days wouldn't be controls
and the two sprays would be controls either so those are out.

Answer 26

awesome. Can you help with the last two? @Photon336

Answer 27

yeah

Answer 28

Ok. Here they are.

Answer 29

let me ask you this question: what are we manipulating here in this experiment? @sunflow1

Answer 30

The tiles


independent variable
the one factor that a scientist changes during an experiment; also called manipulated variable

Answer 31

And I think its D..

Answer 32

I believe that it's the type of cleaner

Answer 33

because they used the same tiles remember?

Answer 34

yes, I kind of confused. :(

Answer 35

@sunflow1 what changes as a result of using a different cleaner?

Answer 36

the tiles?

Answer 37

it's the size of the mildew

Answer 38

Oh right, so it would be B bc the midew changes

Answer 39

Mildew*

Answer 40

so the size of the mildew depends on the cleanser used does that make sense and why?

Answer 41

Yes, because if the mildew grows and grows that means that type of cleanser isn't the kind you want to get. If its less mildew than its the type you would want, am i right?

Answer 42

yes perfect

Answer 43

so what would be the independent variable and what responds to it ( the dependent variable?)

Answer 44

The independent variable would be B?

Answer 45

independent variable = type of cleanser used
dependent variable = growth of the mildew

Answer 46

does this make sense to you? if not let me know

Answer 47

Yes

Answer 48

Ok thank you so much

Answer 49

yeah last thing: Independent variable is what causes the other variable to change dependent variable.

in our case the type of cleanser is what influences the growth of the mildew

Answer 50

once you've identified that relationship you can't get it wrong ever because that's really what it is at the core of it all.