Experimental Design B/C

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mpnobivucyxtz
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Re: Experimental Design B/C

Post by mpnobivucyxtz » January 22nd, 2018, 6:41 pm

Hey guys! I have a couple of questions about the rubric. So for dependent and independent variable, is the dependent variable what you are measuring directly or is it something you can calculate? For example, let’s say we set up an experiment where we end up measuring the effect of drop height on height of ball bounce and our reason is, say, that the higher you drop it from, the greater the impulse sending it back up is. Would our dependent variable be “how does drop height affect bounce height” or “how does bounce height affect impulse”

We can only directly measure bounce height but we can calculate and graph both.

Also regarding sig figs, how would you format sig figs as follows: let’s say your data includes 9.34 seconds and 10.56 seconds. The former is three sig figs, the latter is 4, however, both are to the same degree of accuracy. What do we do in this case?

Thank you for your help!
Last edited by mpnobivucyxtz on January 22nd, 2018, 7:07 pm, edited 1 time in total.

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Re: Experimental Design B/C

Post by dxu46 » January 22nd, 2018, 6:46 pm

mpnobivucyxtz wrote:Hey guys! I have a couple of questions about the rubric. So for dependent and independent variable, is the dependent variable what you are measuring directly or is it something you can calculate? For example, let’s say we set up an experiment where we end up measuring the effect of drop height on height of ball bounce and our reason is, say, that the higher you drop it from, the greater the impulse is sending it back up is. Would our dependent variable be “how does drop height affect bounce height” or “how does bounce height affect impulse”

We can only directly measure bounce height but we can calculate and graph both.

Also regarding sig figs, how would you format sig figs as follows: let’s say your data includes 9.34 seconds and 10.56 seconds. The former is three sig figs, the latter is 4, however, both are to the same degree of accuracy. What do we do in this case?

Thank you for your help!
IV - what you change
DV - what you measure
So, your Statement of Problem would be "How does drop height affect rebound height?"
Sidenote - the experiment on the wiki is exactly what you are talking about.

Significant figures are the numbers after the decimal points, so I would say your above data would be in significant figures.

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Re: Experimental Design B/C

Post by roadscholar11 » January 23rd, 2018, 1:27 pm

Does anyone know how to do the "Other Ways to Look at Hypothesis" Section? It's not entirely clear...Thanks in advance!

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Re: Experimental Design B/C

Post by dxu46 » January 23rd, 2018, 4:09 pm

roadscholar11 wrote:Does anyone know how to do the "Other Ways to Look at Hypothesis" Section? It's not entirely clear...Thanks in advance!
Can you provide a link?

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Re: Experimental Design B/C

Post by terence.tan » February 11th, 2018, 4:11 pm

When you do an experiment that involves changing the concentration, what are you IV levels? Molarity? Grams of solute? ratio of solute to solvent?
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Re: Experimental Design B/C

Post by dxu46 » February 11th, 2018, 5:37 pm

terence.tan wrote:When you do an experiment that involves changing the concentration, what are you IV levels? Molarity? Grams of solute? ratio of solute to solvent?
"How does the ratio of salt to water affect the remaining solution's freezing point in degrees Celsius?"
That is a sample statement of problem. I would go with solvent/solute, especially in an experiment like the above.

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Re: Experimental Design B/C

Post by terence.tan » February 12th, 2018, 3:09 am

dxu46 wrote:
terence.tan wrote:When you do an experiment that involves changing the concentration, what are you IV levels? Molarity? Grams of solute? ratio of solute to solvent?
"How does the ratio of salt to water affect the remaining solution's freezing point in degrees Celsius?"
That is a sample statement of problem. I would go with solvent/solute, especially in an experiment like the above.
So would the iv levels be like:
1:5,2:5,3:5

Or
1gram 2gram 3gram
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Re: Experimental Design B/C

Post by dxu46 » February 13th, 2018, 7:21 pm

terence.tan wrote:
dxu46 wrote:
terence.tan wrote:When you do an experiment that involves changing the concentration, what are you IV levels? Molarity? Grams of solute? ratio of solute to solvent?
"How does the ratio of salt to water affect the remaining solution's freezing point in degrees Celsius?"
That is a sample statement of problem. I would go with solvent/solute, especially in an experiment like the above.
So would the iv levels be like:
1:5,2:5,3:5

Or
1gram 2gram 3gram
Anything really would work, though personally I would go with the ratios because they look a lot more professional :D.

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Re: Experimental Design B/C

Post by Ethancheese123 » February 14th, 2018, 4:28 pm

So i just got this event. Any suggestions?

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Re: Experimental Design B/C

Post by dxu46 » February 14th, 2018, 4:57 pm

Ethancheese123 wrote:So i just got this event. Any suggestions?
The wiki, as usual. Also check the soinc site for more websites. Also, practice is key. Practice with partners = success.

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