CONTROL GROUP for my science fair project? Science teacher/expert please help ;]?

OK, so I have a science fair project to do and my teacher requires us to have a CONTROL GROUP. But I really don't know what my control group is.. My project is basically just testing females and males to see which of the gender would find the change in the image faster.


EX. http://www.cs.ubc.ca/~rensink/flicker/download/Sailboats.mov


(the engine thing beneath the airplane's wing is the change)





This 'flickering' image is an example for a visual perception called 'change blindness' (http://en.wikipedia.org/wiki/Change_blindness) so,


My question is: Is change blindness more prevalent (popular) in females or male?


My hypothesis is: If change blindness were presented to males, then the time figuring out the image change would be slower. (which would mean that 'change blindness' is more popular to males)





So what would be my control group? Or do I have to change my question a little bit? (if you right click on the ex. there are options you can adjust. Is that my control?)CONTROL GROUP for my science fair project? Science teacher/expert please help ;]?
You may need to have your teacher clarify what he/she expects. When you show the same picture to males and females, this is a 'controlled variable' but not a control group. If you want to use a control group, you need 4 groups: one treatment and one control for boys, and the same thing for girls. The 'treatment' group sees pictures that change, and the 'control' group is shown pictures that do not change.





You do this because if people are told to look for changes, they will look for changes even if the changes aren't there. With this type of study, people can make two types of errors: 1) seeing changes that do not occur; and 2) failing to see changes that actually occur. If you do not have a control group, you don't know if how the results are being influenced by the first type of error.





One way to do this without having seperate control groups is to show each boy and girl 6 videos in random order, for a fixed period of time, and with half of the videos having no change. Keep track of the results seperately for the change and no-change videos.CONTROL GROUP for my science fair project? Science teacher/expert please help ;]?
using the same image every time. if that helps any. b/c i'm pretty sure you will want to test many ppl
Your control is the image you are showing to the people. You mus tshow the same image to everyone. If did soemthing different, you experiment would be no good.
The constants (controlled variables) WOULD be the same images


But the control group is different than the controlled variables..





I'm sure she is asking for the control group not the controlled variables.. It's different. Control group is what you are comparing the results too. (For an example, you test to see if certain amount of water affects a plant's growth. There are 3 pots, the 1st pot will recieve 10 centiliter of water a day. The 2nd pot will recieve 20 centiliter of water a day, and the 3rd pot will recieve 30 centiliter of water a day. The average amount of water is 20 centiliter so THAT will be the control group and you will compare the pot that recieves 10 cL and 30 cL of water to the pot that receive the 20 cL (I'm just making up the number but thats what a CONTROL GROUP IS))





For this project however, I can't identify the control group.