## Experimental Design B/C

Phys1cs
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### Re: Experimental Design B/C

jwalkotten wrote:A couple questions if anyone could help
1) it says to give a measure of central tendency (for division C). What does it want here? Because mean, median, and mode, are all measures of central tendency, but we have already given these...
2) what does "other appropriate statistic used" mean? some people have said to get a regression analysis, but how do you get that for all three levels of IV? because your regression analysis is going to be for the line of best fit for your data, but your statistics are supposed to be comparing each of you trials in each level of IV (at least that's what I thought...)
Thanks if anyone could help!
For the other measure of central tendency, Standard Deviation and the Variance (because you need the variance for standard deviation) are common. Those are what I use, because Standard deviation is used to find the general range the data should be falling in.

Regression Analyses are more interpreting your regression, or line of best fit.

tsinzitari
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### Re: Experimental Design B/C

So Me and 2 other people just got thrown in to do this event in Comp (DIV B) any advice

fozendog
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### Re: Experimental Design B/C

tsinzitari wrote:So Me and 2 other people just got thrown in to do this event in Comp (DIV B) any advice
Go over this rubric with your partners and divide the sections that each of you will be doing during the experiment.
http://www.soinc.org/sites/default/file ... 121213.pdf

Our team has a writer, doer, and a helper:
The writer covers sections a-d and n.
The doer covers sections h-k.
The helper covers sections e-g and l-m.

After you separate the sections have your coach give you a set of materials and do an experiment.
Have your coach grade the experiment, then go over it with you and see where you all can improve in your sections.
Then do another experiment to build a relationship with your team and cover any details you need to add.
Stanford '19
Events: Protein Modeling, Cell Biology, Disease Detectives, Experimental Design, Dynamic Planet, Water Quality

jwalkotten
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### Re: Experimental Design B/C

Anyone else have any ideas about what we're supposed to do for "other appropriate statistic used" for Div. C.
Thanks!
2013 Regionals - 1st Overall, 1st Exp. Design, 3rd Anatomy, 5th Disease Detectives
2013 State - 4th Overall, 3rd Exp. Design, 3rd Disease Detectives, 5th Shock Value, 7th Anatomy

fozendog
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### Re: Experimental Design B/C

jwalkotten wrote:Anyone else have any ideas about what we're supposed to do for "other appropriate statistic used" for Div. C.
Thanks!
The statistics we use are:
-Mean
-Median
-Mode
-Range
-Standard Deviation
-Linear Regression (just the slope of the line)

That will get you all the points if done correctly for each IV.
Stanford '19
Events: Protein Modeling, Cell Biology, Disease Detectives, Experimental Design, Dynamic Planet, Water Quality

Flavorflav
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### Re: Experimental Design B/C

Do you do standard deviation for each level, or for all of your levels together?

Phys1cs
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### Re: Experimental Design B/C

Flavorflav wrote:Do you do standard deviation for each level, or for all of your levels together?
each level

jwalkotten
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### Re: Experimental Design B/C

fozendog wrote:
jwalkotten wrote:Anyone else have any ideas about what we're supposed to do for "other appropriate statistic used" for Div. C.
Thanks!
The statistics we use are:
-Mean
-Median
-Mode
-Range
-Standard Deviation
-Linear Regression (just the slope of the line)

That will get you all the points if done correctly for each IV.
How do you do linear regression for each IV? b/c your linear regression is going to compare all three levels of IV correct? so you can't really do linear regression for each level of IV
2013 Regionals - 1st Overall, 1st Exp. Design, 3rd Anatomy, 5th Disease Detectives
2013 State - 4th Overall, 3rd Exp. Design, 3rd Disease Detectives, 5th Shock Value, 7th Anatomy

Phys1cs
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### Re: Experimental Design B/C

jwalkotten wrote:
fozendog wrote:
jwalkotten wrote:Anyone else have any ideas about what we're supposed to do for "other appropriate statistic used" for Div. C.
Thanks!
The statistics we use are:
-Mean
-Median
-Mode
-Range
-Standard Deviation
-Linear Regression (just the slope of the line)

That will get you all the points if done correctly for each IV.
How do you do linear regression for each IV? b/c your linear regression is going to compare all three levels of IV correct? so you can't really do linear regression for each level of IV
A LinReg for each IV can show you how different the values are.. if you have a slope of one and two, one obviously doubles. But does that mean that there is more weight...higher temerature.. what is the significance of the doubling with regards to your lab? That's what I've always used it for. You then can use that data point in your conclusion and analysis to get those points.

fozendog
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### Re: Experimental Design B/C

We just do linear regression for the three averages that are plotted on the graph, not for each IV.
Stanford '19