Experimental Design B/C

Jacobi
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Re: Experimental Design B/C

Post by Jacobi » October 22nd, 2018, 5:34 am

OrigamiPlanet wrote:
Jacobi wrote: Very, very good. Sorry, I should have written A-E. I was just trying to cover the design part of the experiment - which includes all of these things.

You can't have part B or C without A, or parts D and E without A, B, and C, or part M without A-E. You have to build up each component.
If this question. caused significant incovenience, I apologize.
No you're fine! Here's how I'd do it though just to make things easier (and if you can try to answer it, too!).

Prompt: Using the given materials, create a potential experiment about diffusion and list the variables.
- Water (you get as much as you need)
- Red food coloring
- Blue food coloring
- Green food coloring
- 3 popsicle sticks
- 5 250 mL beakers
- A ruler
- A timepiece

The person doesn't need to state their hypothesis, but it does encourage them to create one mentally at the very least, if that makes sense!
For each color (and no color):
1. Add 250 mL of water to a beaker.
2. Add 4 drops of the coloring to each beaker.
3. Soak a popsicle stick in the coloring for 5 minutes.
4. Measure how much the coloring diffuses.
5. Record the data.
6. Repeat 1-5 for the opposite side of the stick.
Independent: Color of the Coloring - the color labeled on the food coloring bottle.  Levels are red, green, blue, and none.
Dependent: Distance traveled by the color (or water) - measured from point of contact with the water to highest mark of the color or water.
Controlled: concentration of coloring, soak time, popsicle stick type.

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Re: Experimental Design B/C

Post by OrigamiPlanet » October 22nd, 2018, 12:25 pm

Jacobi wrote:
For each color (and no color):
1. Add 250 mL of water to a beaker.
2. Add 4 drops of the coloring to each beaker.
3. Soak a popsicle stick in the coloring for 5 minutes.
4. Measure how much the coloring diffuses.
5. Record the data.
6. Repeat 1-5 for the opposite side of the stick.
Independent: Color of the Coloring - the color labeled on the food coloring bottle.  Levels are red, green, blue, and none.
Dependent: Distance traveled by the color (or water) - measured from point of contact with the water to highest mark of the color or water.
Controlled: concentration of coloring, soak time, popsicle stick type.
Mhm, that's perfect!
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Re: Experimental Design B/C

Post by Jacobi » October 22nd, 2018, 4:22 pm

Write an Experimental Errors section for an experiment of your own design.

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Re: Experimental Design B/C

Post by dxu46 » October 26th, 2018, 6:58 am

Jacobi wrote:Write an Experimental Errors section for an experiment of your own design.
My experiment concerns the effect of a cell's environment on the size of the cell. The IV was the cell environment (hypertonic, isotonic, hypotonic), the DV was the cell size, a constant was the size of the initial cell (model), and the experimental control was the IV level concerning an isotonic environment. (kind of required for the errors to make sense.)
In this experiment, there were a couple of errors, but only one will be described. Each cell model was not exactly the same size. This is a systematic instrumental error because it is very hard to measure a cell exactly, and thus the volume would have been slightly influenced. If the starting size of the cell were different, then the end size of the cell would be different. therefore influencing the data slightly of little concern.

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Re: Experimental Design B/C

Post by Jacobi » October 26th, 2018, 7:10 am

dxu46 wrote:
Jacobi wrote:Write an Experimental Errors section for an experiment of your own design.
My experiment concerns the effect of a cell's environment on the size of the cell. The IV was the cell environment (hypertonic, isotonic, hypotonic), the DV was the cell size, a constant was the size of the initial cell (model), and the experimental control was the IV level concerning an isotonic environment. (kind of required for the errors to make sense.)
In this experiment, there were a couple of errors, but only one will be described. Each cell model was not exactly the same size. This is a systematic instrumental error because it is very hard to measure a cell exactly, and thus the volume would have been slightly influenced. If the starting size of the cell were different, then the end size of the cell would be different. therefore influencing the data slightly of little concern.
Looks good!

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Re: Experimental Design B/C

Post by dxu46 » October 26th, 2018, 7:02 pm

Given an experiment concerning the effect of ramp height on rolling distance, the data for 3 IV levels, 2 feet, 4 feet, and 6 feet, the results are 5 feet, 6 feet, and 6 feet for the 1st IV level, the results are 8 feet, 10 feel, and 7 feet for the 2nd IV level, and the results are 15 feet, 12 feet, and 11 feet for the 3rd IV level. Calculate (accurately!) at least 5 relevant statistics.

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Re: Experimental Design B/C

Post by dxu46 » December 26th, 2018, 4:11 pm

Revival:

What is a controlled experiment and how does it relate to this event?

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Re: Experimental Design B/C

Post by naddruf » January 18th, 2019, 9:00 pm

What is a controlled experiment and how does it relate to this event?
Only one factor is varied, and there is a base value of this factor (standard of comparison) that is used to compare against.

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Re: Experimental Design B/C

Post by dxu46 » January 18th, 2019, 9:01 pm

naddruf wrote:
What is a controlled experiment and how does it relate to this event?
Only one factor is varied, and there is a base value of this factor (standard of comparison) that is used to compare against.
FINALLY someone answered!!!
Go ahead, post a question!

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Re: Experimental Design B/C

Post by naddruf » January 18th, 2019, 9:43 pm

For the following experiment:
You mix syrup with water in various concentrations and put 1/4 teaspoon on a napkin. You measure the linear distance the wet stain spreads in 30 seconds from the point of origin to the farthest edge.

1. What type of graph would be best for the data?
2. What are the x and y axes?
3. What type of regression is best?
4. What are the errors in this experiment?

(This is the 1st time I've ever asked a question on here. I don't know if it's good :D )

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