We have been learning about how scientists set up and conduct experiments. In activity 4, we learned about controls, placebos, and how to look at and analyze data. In the Goldfish Respiration lab we used a control to compare the effects of cold on a fish's breathing. We also graphed our results using different sample sizes (our class and all classes) to gather evidence to support or disprove our hypothesis. And, on Monday, we looked at how insect repellents are tested and identified our Control, IV, and DV. The Goldfish lab was good example of a controlled experiment because we only tested one variable; Temperature. The Insect Repellent experiment was not a good example, because some of the test subjects drank Mountain Dew and others did not, which gave us bad data for 2 of the repellents.
Key words
- Independent Variable (IV) The variable that is changed or manipulated in an experiment. The cause.
- Dependant Variable (DV) The variable that responds to the change or manipulation in an experiment. The effect.
- Control- a standard used for comparison that is not changed in the experiment.
- Controlled Experiment- An experiment that tests only one variable at a time. .
Respond to both A and B by Tuesday 9/28
A) Use the link below to watch the Myth Busters video clip. Answer the following questions after watching the clip..
- What was the hypothesis (if and Then)
- What was the control?
- What was the IV
- What was the DV
- Do you think this was a controlled experiment? Provide evidence to support your answer.
B) I would like for you to redesign the insect repellent lab so that it will be a Controlled Experiment. Describe how you would change it, so that we only test one variable at a time.
28 comments:
Jake scott core a
There was no control.
if they make it explode then the water heater will go through the roof and break anything.
the IV was the house because it changed.
The DV was the water heater.
to make the ant reppellent expariment more controlled then i would make everyone drink and eat the same thing.
1. If the psi of a water heater gets too high then it will shoot out of the house.
2. There wasn't a control.
3. The IV was the psi of the water heater.
4. The DV was the water heater.
5. I think it was a controld experiment because they thought that a water heater could become a rocket if it got to hot.
B) To make the insect repellent lab a controled experiment I would have to take out the number of bites that a test subject got after standing insid a room filled with mosqetos.
1. If you put enough pressure in the water heater then it will blow the house up.
2. There is no control.
3. The IV was the pressure.
4. The DV was how fast the house blew up.
5. I don't think this was a controlled experiment because it didn't have a control. You need something to compare it too.
B) For the insect lab I would make it 2 seperate experiments. I would make one for the mountain dew and one just for the bug spray. I would also have had only one control and not 3. I would also make everyone stay in the room full of mosquitoes for more then 10 minutes because you don't really know if the mosquitoes were really biting the people.
What was the control?
if you over pressurize a water heater then it will explode.
What was the IV
The iv is the house because it changed by beging blown up.
What was the DV
it was the water heater.
Do you think this was a controlled experiment? Provide evidence to support your answer.yes i think it was a controled expermint because in the reppellent for bugs was alot more controled by making people drink moutain dew before they tested them.
Q...What was the hypothesis (if and Then)
A...If the water heater explode then it will go 500 feet through the roof.
Q...What was the control?
A...There was no control but maybe the control was another water heater kept at normal.
Q...What was the IV
A...The water heater was the independent varible.
Q...What was the DV
A...The presure in the water heater after makin more pressure to make it shoot throughthe roof of the house.
Q...Do you think this was a controlled experiment? Provide evidence to support your answer.
A...No i dont think this was a controled experiment because if it was than they would of had something to compare it to at normalpresure but the didnt have one to.
A1.The hypothesis was if they put a air compressed tank in a house and it reached a so high PSI then would it go crazy and blow through the roof.
A2.They had no control.
A3.If they put the water heater under to much pressure will it shoot like a rocket.
A4.It reaced pass the tanks pressure and shot up like a rocket about 300 feet in the air.
A5.Yes I think it was because the only thing they were testing was to see if a water heater can shoot up like a rocket.
B.Have a room filled with mosquitos and have the people not eat or drink anything but water because if they had suger it would ruin the experement on testing the bug repellents.
Andrew Hackworth
Core A
1) If there is to much pressure, then the water heater will launch like a rocket.
2) There was no control in this experiment.
3) The IV was the amount of pressure in the house.
4) The DV was the amount of time it took the water heater to explode.
5) This was not a controlled experiment because it did not have a control. This experiment did not have anything to compare too so there was no control.
B) I would change the insect repellant lab by not having anyone eat or drink before the expirement so that there would only be one variable in the experiment.
1. If the water heater was put under pressure , then it will shoot through the roof.
2. There was no control.
3. The IV was the Pressure.
4. The DV was the amount of time it took the water heater to blow up.
5. I don't think This had a control. I think this because there was nothing to compare the expirment too, also the experiment.
What was the hypothesis (if and Then)? The hypothesis was that if you over presurize a water tank then it will turn into a rocket.
What was the control?There was no control in the expeirement.
What was the IV?The IV was the preasure of the water tank
What was the DV?The DV is the wrekage of the house.
Do you think this was a controlled experiment? Provide evidence to support your answer. No because it did not have a control to compare with the over presurized tank.
B) I would like for you to redesign the insect repellent lab so that it will be a Controlled Experiment. Describe how you would change it, so that we only test one variable at a time. I would have nobody eat or drink before the test but have different bog repellants.
Cece D, Core A
A)1.If you raise the PSI then the water heater will become a rocket.
2.There was no control in this experiment. Maybe the control was a normal water heater instead of an over pressurized one.
3.The IV was the PSI.
4.The DV was the water heater.
5.No because there was no control to compare the water heater to. There was also not enough information given to us.
B) I would change the insect repellent lad by having two separate experiments. I would have one experiment where it compared water to insect repellent and the other would compare Mountain Dew to insect repellent. In both experiments the in insect repellent is the control.
A1. If the water heater builds up pressure then it would shoot up through the roof like a rocket.
A2. There was no control in this experiment.
A3. The independent variable is the pressure buliding up in the water heater.
A4. The dependent variable was the water heater that blew up from the pressure change.
A5. No because the house was very small. It would have made a difference if the would have shot the heater from a basement and used different types of roofs.
B. To make this a controlled experiment they should have everybody drink mountain dew one day and use the repellents they had and then the next day substitue mountain dew for water and use the repellents.
A)If the PSI was high then the rocket will shoot up like and not blow up.
A)2.no control
A)3.The IV is the PSI
A)4.The DV is the water heater.
A)5.No there was no control
B).I would change it so that we only send one personin the room at a timeand we wouldnt give people mountain dew before it.
Kylie M.
Core A
A.)1. If you raise the PSI then that will cause the water heater to explode.
2.There was no control in this experiment.
3.The independent variable was PSI.
4.The dependant variable was the water heater.
5.No, because there was no control in this experiment to compare it to.
B.)I would change the number of people who had Mountain Dew on the day of the experiment to 5 so that it would be half of the people in the experiment instead of 2 people. I would do that because, it would help you be able to tell if the Insect Repellent actually worked.
A1. If you rase the psi on the water heater the water heater will explode.
A2. There was no control.
A3.the IV was all the presure building up.
A4. the DV was the water heater blowing up from the presure building up in the house.
A5. No i dont think this was a controled expierment because there was no control to compare it to.
B. One day you give them mountain dew and then you see how many times they got bit. Then the next day you give them water and see how much the get bit.
A.1) If the water heater gets over 330 PSI then, the water heater will burst through the roof.
A.2) There is no control.
A.3) The IV was the PSI. The DV was the water heater. There is no control.
B.)To make the the insect repellant more affective or controlled you could give the people the Mountain dew one day and see how many people get bit then give them water one day and see how many times they get bit for each experiment
A.1) If the PSI rating goes higher then the water heater will burst through the house like a rocket.
A.2) There is no control.
A.3) The independent variable is the PSI rating.
A.4) The dependent variable is the water heater.
A.5) This is not a controlled experiment because there is no control.
B.) To make the insect repellent more controlled you could give the people mountain dew one day and see how many times they get bit then you give them water one day and see how many times they get bit.
Jaina Kloepfer, Core A.
Brianna Keeton
A)
What was the hypothesis?
1.If it explodes the water heater will shoot through the house and break anything.
2.What was the control?
There was no control
3.What was the IV?
The IV was the psi of the water heater.
4.What was the DV?
The DV was the water heater.
5.Do you think this was a controlled experiment? Provide evidence to support your answer.
I believe it was a control experiment, because the water heater could turn into a rocked and shoot through the house if it got too hot.
B.)I would like for you to redesign the insect repellent lab so that it will be a Controlled Experiment. Describe how you would change it, so that we only test one variable at a time.
I wouldnt let anyone eat or drink before the test.
1.)If they turned the heat on really high, then the water heater will explode like a rocket.
2.)There was no control.
3.)The I.V. was the pressure
4.)The I.V. was the pressure
5.)I don’t think it was a controlled experiment because they didn’t compare it to anything else.
B.)To make the insect repellant lab a controlled experiment, I think that they should have one person drink Mountain Dew or something and someone drink water, and someone drink nothing. And see what happens.
What was the hypothesis (if and Then)?
If they make the water heater explode, then the heater will explode through the roof.
What was the control?
There wasnt one.
What was the IV?
The pressure.
What was the DV?
When the house blew up.
Do you think this was a controlled experiment? Provide evidence to support your answer.
It wasnt because it just blew up so quickly.
-----------------------------------
B) I would like for you to redesign the insect repellent lab so that it will be a Controlled Experiment. Describe how you would change it, so that we only test one variable at a time.
I would change it so that no one had mountain dew, and that everyone in the experiment would have ate instead of just a few people.
A1. If the water heater exploded then it would blow through the house roof.
A2.There was no control in the video.
A3.The IV was the pressure building up.
A4. The dependent variable was the water heater which blew up from the building pressure.
A5. No I don't think it was controlled because the house was very small and the heater wasn't in the basement and they didn't do it on more houses. They should have used different roof types and more test to make it more controlled.
B. You would make everyone drink mountain dew one day and use the same repel they had and see how much they get bit. Then the next day sub the mt. dew with water and see how much they get bit.
1Q.What was the hypothesis.?
1A.If the water heater has pressure then it will turn into a rocket.
2Q.What was the control?
2A.There wasn't a control
3Q.What was the IV
3A.the house because it changed
4Q.What was the DV
4A.Th water heater
5Q.Do you think this was a controlled experiment? Provide evidence to support your answer.
5A.I think that this was a controlled experiment because they thought if the water heater got to hot then it would turn into a rocket.
A:
1. The hypothesis was that if there was too much pressure then the water heater would launch out of the roof.
2. there was no control
3. The amount of pressure in the water heater
4. the dv was how long it took for the water heater to burst through the roof
5. This was not a controlled experiment because ther was not a control so there was nothing for the evidence from the experiment to compare to.
B: I would have made the lab better by not allowing any of the subjects to have any sugar substances before the experiment took place. I would also have had a bigger sample size for more accurate evidence.
If the water heater builds up perssure then the water heater will explode.
There is no control in this experiment.
The pressure builded up and the water heater was the I.V.
The D.V was the water heater
I would have them drink and eat the same thing
brittany mahoney core b,
1.Hypothesis;
if the heater gets to hot then it will explode through the house.
2.The control is a normal water heater under normal pressure.
3. The IV is the water heater and pressure.
4. The DV is the house blowing up caused by the pressure.
5.It is a conrolled expirement because they only tested one variable, the pressure.
B).
I would redesign the experiment by having only one water repelant for a better contol. I also wouldnt let anyone drink mt.dew before the experiment either or it may throw off the results. Taht is how i would make it mor controlled.
ryan t core a
There was no control group in this experiment.
If the mythbusters made the water heater explode then it would go through the roof and just about anything.
The dependant variable was the water heater
The independant variable was the little shack because it changed shape
If i would want to make the repellant better then i would make everybody eat,drink, and do the same thing during the test.
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