Post by: The Detective on November 01, 2010, 10:55:41 am
but practice exam answers are usually about the difficulty controlling participant extraneous variables
I know both are correct but would examiners more likely give the mark for the latter response?
Thanks
Post by: sillysmile on November 01, 2010, 11:13:53 am
but the differences in participant characteristics between the groups is a more obvious disadvantage..
it's probably a better disadvantage to mention.
Post by: jinny1 on November 01, 2010, 11:26:53 am
Post by: sillysmile on November 01, 2010, 01:26:07 pm
how small do the sample need to be for it to be deemed not repreesentativeI have heard that 30 is considered the smallest size that can be representative.
but I'm not completely sure.
Post by: Russ on November 01, 2010, 02:32:00 pm
Post by: sillysmile on November 01, 2010, 02:53:56 pm
It's worked out statistically, but I don't think you need to know it. Have they changed Psych at all in the last few years?not since 2005 I think.
Post by: iNerd on November 01, 2010, 04:48:03 pm
It's worked out statistically, but I don't think you need to know it. Have they changed Psych at all in the last few years?isn't it n = rootN where n is your sample size and N is your population.
So if you have 100 kids doing Psychology you'd need to experiment on root100 = 10 ...to be a proper "sample". Not sure lol; someone slam this if its totally wrong
Post by: minilunchbox on November 01, 2010, 05:37:24 pm
Post by: sillysmile on November 01, 2010, 05:39:27 pm
What's another advantage for independet groups apart from no order effect?it is the easist and most time effective design.
Post by: masonnnn on November 01, 2010, 06:02:53 pm
and
how small do the sample need to be for it to be deemed not repreesentativewe learnt that 10% is usually required.
yet if you get asked for a sample size just say like, 100. that large a number should always do.
Post by: Visionz on November 01, 2010, 06:05:38 pm
What's another advantage for independet groups apart from no order effect?
IMO thats a weakkkkkk advantage anyway. Its the disadvantage of another design rather than a direct advantage of IG design.
Post by: sillysmile on November 01, 2010, 06:06:07 pm
i'd say individual participant variables is the main one as 'more participants required' would also apply to matched-participant so it's not really a disadvantage specific to just independent groups design.
andhow small do the sample need to be for it to be deemed not repreesentativewe learnt that 10% is usually required.
yet if you get asked for a sample size just say like, 100. that large a number should always do.
yeah, but there is much less difference in ppt characteristics in matched pairs.
Post by: sillysmile on November 01, 2010, 06:07:00 pm
but they do have advantages and disadvantages relative to each other.What's another advantage for independet groups apart from no order effect?
IMO thats a weakkkkkk advantage anyway. Its the disadvantage of another design rather than a direct advantage of IG design.
Post by: Glockmeister on November 01, 2010, 10:06:37 pm
The problem with saying things like 10% of the population of
Post by: jinny1 on November 01, 2010, 10:12:51 pm
The problem with saying things like 10% of the population ofis that say you're trying to generalise to the entire world. With the world population now standing at 6,697,254,041 that would mean you need 669,725,404.1 people or 81836.75 people to get a meaningful sample. Not feasible, one would think.
geeeez GLockmeister even knows the exact number of humans on Earth... is he God or somethin?
Post by: sillysmile on November 01, 2010, 10:16:28 pm
if god uses google.
The problem with saying things like 10% of the population of
geeeez GLockmeister even knows the exact number of humans on Earth... is he God or somethin?
Post by: jinny1 on November 01, 2010, 10:17:23 pm
Post by: minilunchbox on November 01, 2010, 10:18:06 pm
What's another advantage for independet groups apart from no order effect?
IMO thats a weakkkkkk advantage anyway. Its the disadvantage of another design rather than a direct advantage of IG design.
Yeah, it's a pretty dodgy one. That's why I was looking for others.
Post by: Glockmeister on November 01, 2010, 10:23:44 pm
The problem with saying things like 10% of the population of
geeeez GLockmeister even knows the exact number of humans on Earth... is he God or somethin?
If Google counts as God, then yes.
Post by: jinny1 on November 01, 2010, 10:25:06 pm
Post by: sillysmile on November 01, 2010, 10:26:07 pm
google is the closest thing to God humans have ;)hahahaha, I like your thinking ;)
Post by: Slumdawg on November 01, 2010, 10:26:38 pm
Yer I came across this problem earlier in the year. I realised there aren't many advantages because it's the worst design to use (according to psychologists).. Just go with easy and efficient, and there being no order effect seems to be accepted so if they ask for just one go with the first, but if you have to write two, "no order effect" seems to be okay too.What's another advantage for independet groups apart from no order effect?
IMO thats a weakkkkkk advantage anyway. Its the disadvantage of another design rather than a direct advantage of IG design.
Yeah, it's a pretty dodgy one. That's why I was looking for others.
Post by: studying_hard on November 01, 2010, 11:20:45 pm
Post by: sillysmile on November 02, 2010, 12:36:05 am
would an advantage be that there are no order effects? :)yes.