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.
29 comments:
A) 1- If the water pressure builds up enough, then it will blow a hole in the roof.
2-There is no control in the experiment.
3-The independent variable is the water pressure.
4-The dependant variable is the house.
5-No, I do not think the experiment is controlled because they only tested one variable.
B) To change the insect repellant experiment, I would have tested the variables in order. I would test the water first and then the actual insect repellants.
A)
1. If the water heater builds up enough pressure then the water heater will blow a hole through your roof.
2. The normal air pressure of a water heater.
3. The independent variable is the water pressure.
4. The dependent variable is the house.
5. No I don’t think it was because they didn’t use more than one variable.
B) If I could change the insect repellent experiment, I would have tested the water first and the all of the other repellents so that I could test one variable at a time.
What was the hypothesis? If their was alot of pressure on the house then the house would go streight up in the air.
What was the control? The control was to what the house woukld do if it has a rocket in it.
What was th IV? was the change in psi.
What was the DV? The steam that builds up in the water tank.
Do you htink this was a controll expierment? Provide evidence to support your answer.it was but it ewasnt because they put the rocket in the house but they didn't know what was going to happen until after the expierement.
1.If the PSI reached a certain amount then it would turn into a rocket and shot out of the house.
2.The water heater and 150 PSI.
3. The water heater.
4 The water heater that busted out of the house.
5. I think it is a controlled expirement because they had control of how the PSI was going.
Derek Allen
A)1.If the water heater builds up enough pressure then it will explode through the roof.
2.A normal water heater with normal preassure.
3.The change of water preassure
4.The water heater turned into a rocket.
5.Yes because the did all the things like a normal house and water heater but they build up the pressure.
B) To make the lab a controled experiment i would of done people that ate food befor the experment and people who didnt for each experment.
(Katie Koch core B) the hypothesis is, if the pressure in the water heater was high then it would blast through your roof. The control was a normal water heater. The IV was the P.S.I the DV was the water heater shot like a rocket. Yes, I do think it was a controlled experiment because they compared it to a normal water heater.
1.What was the hypothesis.
if the water heater can build up enough pressure than it should blow a hole in your roof.
2.What was the control? the water heater at 150psi
3.What was the IV .
The IV is the psi in the water tank
4.What was the DV .
the hot water tank shot like a rocket.
5.Do you think this was a controlled experiment? Provide evidence to support your answer.
Yes Because it had a controll,hypythisios and a IV and DV.
1. The hypophisis is if the pressure in the heater builds up high enough then it will act like a rocket and blast through your roof.
2. The control is a regular 150 psi water heater .
3. The IV was the water prssure building up in the heater. The DV was the roof blasting and destroyed by the water heater
4. Also I do not think it's a controlled experiment because it only tested one heater wich is the one variable.
B. I would not allow the people drink mtn. dew and i would have one water so it can all be an even test.
A 1 If the water heater builds up enough pressure then it will blow a hole in though your roof.
2 The control is the heater at 150 psi.
3 The IV was the pressure of the heater.
4 The DV is the water heater shooting up like a rocket.
5 It was a controlled experiment because it had all the information. It had the control which was 150 psi and a good hypostasis and an IV and a DV.
B I would give half the repellents mountain and the and the half of the same repellent without mountain dew not just 2 repellents
A)
1)If the water heater builds up pressure then it will blow a hole through your roof.
2)The normal water heater at 150 psi.
3)The water heater at 300 psi was the IV.
4)The DV is the house.
5)Yes this was a controlled experiment, because they used a normal water heater at 150 psi as a control, and raised the pressure to create a rocket that will blow a hole through the roof.
B)I would have two subjects for every repellant, and give one subject Mountain Dew, then give the other one nothing. So that you can compare the results of people who had Mountain Dew for one repellant, with the other results of the people who had nothing for the same repellant.
Emily K. Core B
A.
1. If the pressure in the water heater was high, then it would blast a hole thruogh the roof.
2. A normal water heater.
3. The change in PSI to turn into a rocket.
4. The pressure inside the tank.
B. I would change the experiment by doubling the amount of people and test 2 people per repellant and give 1 of the 2 people Mountain Dew and the others nothing to drink or eat.
A) 1. My hypothesis is if the water heater builds up enough pressure then it will blow up the house
2. The control is the normal pressure of the water heater.
3. The IV is the air pressure
4. The DV is the house
5. I think this is a controlled experiment because, they only test one variable.
B) To make this a controlled experiment you need to have every one treated the same. Some people had Mt. dew before the experiment; this caused the bugs to attract to them more and not the other people.
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 make this a controlled experiment by;
How many mosquitos they are.
Give half the people Mountian Dew and the other half water. I would also give some people water as the repelint.
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 bye udsing diffrent products in this expierement,insead of mountain dew i would use orange juice. that would change the whole way mosquitos react too the medicine.
A) 1. Their hypothesis was, if the water pressure builds up enough then it will blow up the house.
2. The control of this experiment is the normal pressure of the water heater.
3. The IV of this experiment was the air pressure.
4. The DV of this experiment was the house.
5. Yes I do think this is a controlled experiment, they were changing the PSI in the air pressure of the water heater amount.
B) To make this a controlled experiment you need everyone to be treated before the experiment the same. Ware before some people drank mountain dew some did not; this caused the mosquitoes to attract to the people who drank mountain dew. This is how you can make it a controlled experiment.
Nina Mazza Core B
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)
2. What was the control?
3. What was the IV
4. What was the DV
5. Do you think this was a controlled experiment? Provide evidence to support your answer.
(Mariah Schneider core B) 1. If the heater builds up Inhofe pressure then it will blow through the rough. 2. The normal water heater was the control. 3. The heater busting through the rough. 4. The rough was the dependent variable because it was what the heater busted through. 5. No because they didn’t know what was going to happen.
Tori Holtman Core B
1. If the pressure builds in the water heater then the water heater will shoot through the roof.
2. The control in the experiment is a normal water heater 150 psi.
3. The independent variable is the steam.
4. The dependent variable is that the water heater is a rocket.
5. I think that it was a controlled experiment because they only test is how the pressure builds in the water heater.
B. To make it an control experiment I would not give the people nothing to food or drink then it would be a control experiment.
B)I would take a couple of volenters and let they go out side with no bug spray on then I would make them come inside and put one type on bug spray on on person then diffrent types on the rest and I would see which one works best when they all come back in. (Mariah Scneider core B)
Keleigh Bowman Core B
1. If the water heater builds up enough pressure than it could blow a hole through the roof of the house.
2. The control in the experiment was a normal water heater.
3.The Independent Variable in this experiment would be the 300 PSI Water Heater.
4.The Dependant Variable would be it turned the water heater into a rocket and it shot up.
5.I think that this experiment was a controlled experiment because they are testing how the PSI builds in the tank until in shoots off.
B. I would make it more controlled by changing the number of people that drank mountain dew so that it’s equal to the number of people who didn’t drink mountain dew and to make it to where we are only testing one variable at a time I would take the people that didn’t have mountain dew and then put a bug repellant on them and see how it turns out and then take the people that didn’t have mountain dew and put bug repellant on them and I would do this for every bug repellant. Then I would compare the both.
(Katie Koch, core B) If I was redesigning this experiment I would test one repellent at a time, then test the water, I also would have had more people drink the Mt.Dew, then test it at a separate time, I would also have a larger sample size
A; 1.If the water heater has more presure then the water heater will go through your roof; shoot up like a rocket.
2.The control is a normal water heater under small pressure.
3.The IV is the water heater and pressure.
4.The DV was the house exploding.
5.Yes it is a control expirement because they only tested the pressure.
B; I would change it by having a bunch of different people come in and each of them try different repellants, And not let anybody drink moutian dew, it can make rescult's different.
Sara King
Core B
A)
1)The hypothesis: If the water heater built up enough PSI(pressure) then it would explode along with the house.
2) A normal water heater with normal pressure(though it did not show a control in this expiriment)
3)The (IV) was the water pressure.
4) The (DV) was the house.
5)This was not a controlled expiriment becuase they only tested one variable, not two or any other number.
B)
To redesign the insect repellant lab I would only test one variable at a time sych as water first then the repellant and then the client drinking mountain dew and putting on the repellant and maybe mountain dew and water just to test many variables.
1.the hypothesis if the water gets really high then it will combust up and shoot out of the house. 2. That how the water was hotter rather than normal because the hotness made it shoot up. 3. The tempautre in the experiment.4. The affect was that the water heater shot out of the house. 5.I think it was controlled because they could control the psi.
1.If the water heater reaches a certain temperature then the house get torn down.
2.The control is a normal pressure in the heater.
3.The IV was the water heater building up pressure.
4.The DV was the house blowing up.
5.It was a controlled experiment because they were only testing the pressure.
B. I would make sure nobody drank or ate before the experiment and nobody did anything different. The only thing I would make sure would be different is the repellant.
A) 1. If the water heater has enough presser then it could blow up a house.
2. The normal presser of a normal water heater.
3. The Independent Variable is the increasing presser.
4. The Dependant Variable is the exploding water heater.
5. I think that it is a controlled experiment, because only one water heater was being tested.
B) I would have no one drink mountain dew, and have more people in that experiment. Then I would only test OFF to make it a controlled experiment.
Taylor Haynes Core B Week 4
A)1. If the water heater heater’s pressure was high then it could blow up and go through the roof of the house. 2. The control water heater’s normal pressure. 3. The IV was the water pressure inside the tank. 4. The DV is the water heater. 5. Yes, this was a controlled experiment because they compared the normal water heater to the one that exploded.
B)I would change the insect repellant experiment by making more people do the whole experiment and I would have had more people drink Mountain Dew.
Blog week 4.
Marissa McCarthy
A.1) If the water heater’s pressure is higher than it’s sopost to be then it will go through the roof of the house.
A.2) The control is the water heater’s normal water pressure.
A.3) The independent variable is the water pressure inside the tank.
A.4) The dependent variable is the water heater.
A.5) Yes, because they compared the water heater that exploded to the water heater that didn’t explode.
B) I would change the insect repellant experiment by making more people do the whole experiment and I would of had more people drink mountain dew.
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