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..
http://www.youtube.com/watch?v=JmJoyuUJj2Q
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.
- 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.
http://www.youtube.com/watch?v=JmJoyuUJj2Q
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:
Core C
Matthew Hurley
A.1. If the water heater is super heated then it can blow to the roof.
A.2. The control is the regular water heater.
A.3. The independent variable is the heat of the water heater.
A.4. The dependant variable is the house.
A.5. Yes because they only tested one variable at a time.
B. I think that we should only test one fish at a time so that it can be a controlled experiment.
Core 3
Maddie Wilhoit
A)Hypothesis- If the water heater is super heated then it will blow threw the roof.
Control- Water heater at normall temperature
Iv- They increased the pressure on the water heater
Dv- Water heater shot like a rocket.
I do think this is a controlled experiment because the control didn't change.
B)I would change it to were noone drank the mountain dew.
the hypothsis of this is that if you incresse the psi in the water heater then the water heater will explode.
the control of this experment is that the water heater has a normal psi.
The independent varible in this is that the pressure in the water heater was incressed.
The dependent varible is that the water was in the same pressure.
I think that this was a controled experment because the had the control controlled.
B. I would change the fact that they gave out mountian dew to some people and not to the other people so i would give everyone mountain dew or no one.
1. What was the hypothesis (if and Then)
If the water heater gets too much pressure then it will blow up.
2. What was the control?
The air pressure inside the water heater.
3 What was the IV
The pressure
5. What was the DV
The water tank
B Do you think this was a controlled experiment? Provide evidence to support your answer. Yes because they only tested one thing.
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.
7. I would of tested the inscet variables in order and I would of tested the water first.
SAMANTHA HOELMER CORE C
(A.)
Answer 1. If the water heater’s pressure becomes too high, then it will burst up into the air.
Answer 2: The control was a water heater operating at a normal PSI rate.
Answer 3: The independent variable in the experiment is the pressure of the water heater.
Answer 4: The dependent variable in this experiment is the water heater shooting into the air like a rocket.
Answer 5: This was not a controlled experiment, because the test they ran tested both the dependent and the independent variables at the same time.
(B.)
To make this experiment a controlled experiment, I would make it so that nobody in the experiment would drink Mountain Dew prior to the experiment. I
A.if the water gets to hot then it will blow threw the roof.
The control was the psi.
The IV the psi rising.
The DV the water heater shot like
a rocket.
its not a controlled exsperiment because they didnt compare anything to it.
B.i would change it by taking out 2 of the water varieables.
Answer 1. If the water tank is heated then it would shoot up like a missile.
Answer2. A water tank that is at regular temperature and psi.
Answer3. The independent variable is the pressure of the water.
Answer4. The dependant variable in this experiment is the bursting of the water tank.
Answer5. I do not think that this is a controlled experiment because it tested two things the water pressure and the bursting of the water tank.
Answer B: To make this experiment a controlled experiment I make nobody drink the mountain dew prior to the experiment.
1. What was the hypothesis (if and Then)
If the water heater gets super heated then it will blow through the house
2. What was the control?
The control was a regular heated water heater.
3. What was the IV
The independent variable was that the heat of the water heater increased.
4. What was the DV
The dependant variable was the water heater got so hot the water heater blew through the house like a rocket.
5. Do you think this was a controlled experiment? Provide evidence to support your answer.
The experiment was not controlled because we didn’t have a normal water heater to compare it to.
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.
To make this a controlled experiment you would have to change the fact that either every one or no one in the group should have received mountain dew. I would change it so that each person in the sample size would receive the same bug pray and then compare the number of bite each person got. I would do this for each type of bug spray.
Core: C
A)
1. If the water is super heated then it can blow through the roof.
2. The cotrol was the water heater that wasn't super heated.
3. The independent variable is the heat of the water heater that increased.
4. The dependant variable is the water heater blowing through the roof of the house.
5. Yes, i do think this was an controlled experiment because the control never changed.
B) I would not of let any of the people in the trial for the bug spray drink Mountain Dew because the sugar from the pop attracted the mosquitoes.
Sarah Keethler
Core C
9-21-10
A)
1.
Hypothesis- The hypothesis of this experiment is if the water heater was hot enough then it will shot out like a rocket.
2.
The control in this experiment was the water heater at normal temperature.
3.
The independent variable was we increased the pressure of the water heater.
4.
The dependent variable was the water heater shot like a rocket.
5.
I do think this was a controled experiment because they compared it to the water heater at normal temperature.
B)
To make the "repellant experiment" a controlled experiment I would have not made them drink Mountian Dew so they have something to compare it to because it did change the effect of the bite. To only test one variable we would have to have all people the same for example in the mountain dew experiment two people had mountain dew and all the other people didn't drink anything so it could have an affect on the mesquitoes bite.
Nick Willis
A1. If the pressure builds to much the heater will explode.
A2. The heater was the control.
A3. The IV is the pressure building in the heater. The DV is the heater exploding.
A4. Yes, because they made it blow up themselves.
B. You would use one bug and see the effect when you use different repellents.
Noah Griffith
A)
1. Their hopothieses was that if the pressure inside the water heater increased would it blow a hole through your house.
2. The control in this experiment was a water heater at normal tempurature.
3. The IV is the pressure in the water heater was increased to 350-psi.
4. The water heater turned into a rocket and shot through the roof at amazing high intesity speed.
5. Yes i do think this is a controlled experiment, because only one thing was being tested. The water heater was the only thing being tested.
B)The thing that i would change is have the people who are doing the experiment to all drink mountain dew.
A: If the water heater gets too hot, then the water heater will shoot through your roof like a rocket.
The water heater at normal temperature was the control.
The independent variable is the pressure of the water heater.
The dependent variable is the water heater getting to hot and shooting up in the air.
It was a controlled expirement because there was only one variable that changed (the pressure of the water).
B: In order to change this expirement into a controlled one, You would use one reppelant and use a different persons arm.
Rachel Reif, Core C
A: If the water heater didn't have as much pressure, then the house wouldn't shoot up.
*The control is that experiment was the water heater at normal temperature.
*The independant variable is the pressure of the water heater.
*The dependant variable in this experiment is the water heater shooting up in the air.
*This is a controlled experiment because there was only one variable that changed and it was the pressure of the water heater.
B:In order to change this experiment into a controlled one, I would've only used one spray/repellant and used a different person's arm rather than using the same one.
Amy Hetzel
Core C
A.
1.) The hypothesis in this movie is if you increase the pressure then the water heater will explode.
2.) The control is the water heater with a normal temperature.
3.) The IV is the pressures increasement.
4.) The DV is that the water heater explodes.
5.) Yes because they only used one control in this experiment.
B.I would not give anybody the mountain dew because the sugar in the pop would attract the mosquitoes.
A. it if you turn up the pressure then can blow up.the control is the heater. the iv is the pressure building up in the heater. The dv is the heater exploding.
B. I would not give some mountain dew i would have them fast and then test them. Then i would give them all mountain dew and test them.
A) Use the link below to watch the Myth Busters video clip. Answer the following questions after watching the clip..
1. What was the hypothesis (if and Then)? If the water heater gets to hot then it will explode.
2. What was the control? The control is the water heater at normal temperature.
3. What was the IV? The independent variable is the pressure that’s being added.
4. What was the DV? The dependent variable was we increased the pressure of the water heater and when it got to high it exploded.
5. Do you think this was a controlled experiment? Provide evidence to support your answer. Not really, because they didn’t compare it to anything. And in order to have a good experiment you should have two things so you can compare the data.
B) I would change the experiment by testing and using a bigger variety of data. I would have half the people drink of mountain dew and half not.
Core C
Savanna Bachler
A) 1 the hypothesis is, if the water heater has to pressure then the heater will shoot up in the air.
A) 2 the control in this experiment is that the water heater is at normal temperature.
A) 3 the independent variable is the pressure of the water heater.
A) 4 the dependent variable is that since the water heater pressure is very high then it will shoot up in the air.
A) 5 Yes I do think this was a controlled experiment because there was only one variable that changed and that was the pressure of the water heater.B) In order to change this experiment into a controlled one, I would have only used one spray/repellent and used a different persons arms instead of the same persons arm.
Chris Adl
A:
1- The hypothesis was that if the pressure bulids up then the water heater will shoot up thru the house.
2- The water heater at normal PSI was the control.
3- The Independant Varible is the pressure building up.
4- The Dependant Varible is that the water heater shot up thru the roof.
5- This was a controlled experiment because there was a control, a Iv, and a Dv.
B:
1-The volunteers will not be permitted to drink mountain dew.
2-Each volunteer will each have their arms sprayed with a different repllant except for 4 of them will be sprayed with water to act as the control.
3-our IV will be the repellants and the DV will be the number of bites the volunteers get.
A.
1.If enough steam builds up enough pressure in the water heater then it will blow out of the house like a rocket.
2. The control was the house.
3. The IV Was the pressure in the water heater
4.The DV was the water heater blowing out of the house like a rocket
5.Yes, because they made the pressure build up in the water heater to make it blow out of the house like a rocket.
B. I would have someone put their arm on with nothing on it at all then i would have someone put their arm in with water and then i would start testing the repellents. Another thing that i would do would have everybody drink water and make sure that they didnt drink pop by having them drink nothing for an hour before the experiment
1. If you heat the water heater to a certin PSI then it can blow thrugh the rof in your house.
2.The normal water heater
3. We heated the water heater to see wat it did and it blew through the roof.
4. It is the house.
5. No, because they only did one varriable at a time.
A.) If the pressure builds to high then the water heater will shot like a rocket. The control is the heater. The IV is the pressure building up in the heater and the DV is the heater shoting like a rocket.
B) I would not give anybody mountin dew i would make all of them go hungry.
A1.If the water heater is super heated then it can blow the roof off.
A2.the control in the experiment was the water heater at normall temperature.
A3. The independent variable is the heat of the water heater
A4. The dependant variable is that the water heater shot like a rocket
A5. No I dont think this was a controlled experiment because they didnt have a regular water heater to compare it.
B)I would change it to were no one drank the mountain dew because i think that it would make no diffrence if some one drank the mountain dew.
A) Use the link below to watch the Myth Busters video clip. Answer the following questions after watching the clip..
1. What was the hypothesis (if and Then) if the pressure increases,
2. What was the control?
3. What was the IV IV: the water pressure
4. What was the DV DV: the explosion of the water heater
5. Do you think this was a controlled experiment? Provide evidence to support your answer.
A answer: #1: If you over pressure a water heater, then it will suddenly cause a deadly explosion and blow through your house
#2: There is no control in this experiment
#3: The IV was the pressure
#4: The DV was the amount of time it had taken for the water heater to explode
#5: No, there is no control to compare the over-pressurized water heater with a normal one.
http://www.youtube.com/watch?v=JmJoyuUJj2Q
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.
B answer: I would have everyone not drink Mountain Dew before the experiment. Mountain Dew has a lot of sugar, which attracts bugs, especially mosquitos. If the people do not drink the Mountain Dew, everyone who would be participating would have the normal sugar level in their bodies.
Alex Hornsby
Core C
The DV was supposed to be the amount of time it had taken for the heater to explode, not the explosion(I thought I had deleted that)
A1. The hypothesis is if you increase the psi then the heater will explode, causing the shed to erupt.
A2.The control is the water heater at normal pressure.
A3.The indepentdent is the pressure of the water heater.
A4. the depentdent is the water heater blastign up out of the shed.
A5. Yes, because the control was never changed.
B. I would change it so that nobody would drink mountian dew, making it a contorlled expermint.
A)
1. The hypothesis was that if the water heater has enough pressure or heat than it will blow through the roof of the small red house. 2. The control was the normal water heater going at a normal PSI rate. 3. The IV was the pressure slowly rising inside of the water heater. 4. The DV is that when the water heater shot up in the air like a rocket!
B) I think it could if you made shore that they all ate the same thing and drunk the same thing and they all had the same blood type.
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