Experimental Design B/C

Jacobi
Exalted Member
Exalted Member
Posts: 137
Joined: September 4th, 2018, 7:47 am
Has thanked: 0
Been thanked: 0

Re: Experimental Design B/C

Post by Jacobi »

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.
User avatar
OrigamiPlanet
Member
Member
Posts: 156
Joined: August 6th, 2017, 12:15 pm
Division: C
State: PA
Pronouns: He/Him/His
Has thanked: 2 times
Been thanked: 22 times

Re: Experimental Design B/C

Post by OrigamiPlanet »

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!
Div. C - Cumberland Valley High School

Events
Astronomy; Codebusters; Dynamic Planet

Howdy partner ;)

Email me for anything! Aliases are HeeYaww and v_v_vle
Jacobi
Exalted Member
Exalted Member
Posts: 137
Joined: September 4th, 2018, 7:47 am
Has thanked: 0
Been thanked: 0

Re: Experimental Design B/C

Post by Jacobi »

Write an Experimental Errors section for an experiment of your own design.
User avatar
dxu46
Exalted Member
Exalted Member
Posts: 809
Joined: April 11th, 2017, 6:55 pm
Division: C
State: MO
Pronouns: He/Him/His
Has thanked: 2 times
Been thanked: 7 times

Re: Experimental Design B/C

Post by dxu46 »

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.
Jacobi
Exalted Member
Exalted Member
Posts: 137
Joined: September 4th, 2018, 7:47 am
Has thanked: 0
Been thanked: 0

Re: Experimental Design B/C

Post by Jacobi »

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!
User avatar
dxu46
Exalted Member
Exalted Member
Posts: 809
Joined: April 11th, 2017, 6:55 pm
Division: C
State: MO
Pronouns: He/Him/His
Has thanked: 2 times
Been thanked: 7 times

Re: Experimental Design B/C

Post by dxu46 »

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.
User avatar
dxu46
Exalted Member
Exalted Member
Posts: 809
Joined: April 11th, 2017, 6:55 pm
Division: C
State: MO
Pronouns: He/Him/His
Has thanked: 2 times
Been thanked: 7 times

Re: Experimental Design B/C

Post by dxu46 »

Revival:

What is a controlled experiment and how does it relate to this event?
naddruf
Member
Member
Posts: 10
Joined: January 18th, 2019, 8:18 pm
Has thanked: 0
Been thanked: 0

Re: Experimental Design B/C

Post by naddruf »

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.
User avatar
dxu46
Exalted Member
Exalted Member
Posts: 809
Joined: April 11th, 2017, 6:55 pm
Division: C
State: MO
Pronouns: He/Him/His
Has thanked: 2 times
Been thanked: 7 times

Re: Experimental Design B/C

Post by dxu46 »

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!
naddruf
Member
Member
Posts: 10
Joined: January 18th, 2019, 8:18 pm
Has thanked: 0
Been thanked: 0

Re: Experimental Design B/C

Post by naddruf »

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 )
Post Reply

Return to “2019 Question Marathons”

Who is online

Users browsing this forum: No registered users and 2 guests