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.
32 comments:
1.What was the hypothesis (if and Then) If 350 pressure is pushing on the inside of a water heater then it will shoot up through a roof.
2What was the control?
A regular water heaer with normal pressure
3What was the IV
The pressure inside of the water heater.
4What was the DV
the water heater turned into a rocket
5Do you think this was a controlled experiment? Provide evidence to support your answer.
Yes because they controlled the water pressure inside the water heater and kept the other on normal
A.)If you put the normal water heater with more pressure, then the rocket would shoot through the roof of the house. The control is a normal water heater under normal pressure. The IV waas the increased pressure on the water heater. The DV is the water heater turned into a rocket. This was a controlled experiment because they tested one variable at a time.
B.)I would change it so that only one person got sprayed with water and no one drank Mountain Dew before the experiment.
A)If the water heaters psi got high then it would go flying. The independant variable was the increased water pressure. The dependant variable was the water heater turned into a rocket. The control in this expirment was the regular water heater. I thought it was a controlled expirement because they used a normal water heater.
B) If everyone drinks water and eats nothing, then the controlled expiement will be better. The only thing that would change is the bug spray. Then it would be testing one varible at a time, and a controlled expirement.
B;
The thing i would change about the bug insect repllent experiment is that they should record the certain people who have diffrent blood types and see how or if it effects them diffrently.
Katelyn Dole
Core D
A.)
1. The hypothesis is if a water heater goes over +300 PSIs then it will blast threw your roof and floor.
2. The control is a normal water heater, under normal pressure.
3. The IV is the water's pressure
4. The DV is the water heater that got so high in PSIs it blasted through the little house's roof.
5. Yes I do think this was a controlled experiment, because they could control the water's pressure.
B.) To make the Insect Repellant lab more controlled I'd change; the people getting tested, have different blood types to see how the repellants work on them and compare their data to other blood types.
The hypothesis was if the PSI was raised high enough then the tank would take off into the sky.
The control was how good the house was built.
The IV was the buildup of the PSI
The DV was the tank taking off into the sky.
I think this experiment was controlled because they had a myth from someone that it actually happened so they tried to test it in real life.
I would redesign it by having all the sugary tested to see if its only one drink or all the drinks because Mountain Dew is known for having a lot of sugar and other ingredients.
Core D Ryan Noell
A) If you put enough pressure in a water tank it will explode.
The control was the water heater.
The IV was the water pressure. The DV was the rocket.
Yes i think this was a controlled experiment because because it had the control of the water pressure in it.
B) To make the insect repellet a controlled experiment I would do two experiments, the first experiment i would make everyone have water and see how many people get bit, and then for the second experiment i would make one person have water with sugar in it and see how many people get bit and see what happens from there.
A) 1. If they made the pressure go up, then the water heater would explode and the house would blow up.
2. The water heater was the control in this expirement.
3. The independant vairable in this expirement was the pressure of the water heater.
4. The depndant variable was the water heater.
5. This was a controlled expirement. It is a controlled expirement because they kept increasing the pressure of the water heater to see what it did.
B) I would change the insect repellant expirement by applying more insect repellant to 1/3 of the vollunteers, making another third of the volluneteers drink an energy drink, and have the remaining vollunteers just have a normal amount of insect repellant without drinking and energy drink before or during the test.
A.The hypothesis was if the water heater was at a higher water pressure (P.S.I.) the rocket would shoot trough the roof of the house. The control was a water heature that was at normal pressure. The independent variable was the water pressure increasing. The DV was the water heature turning into a rocket. Yes this was a controlled expirement because they tested one heater at a time.
B. To make the insect repellant a controlled expirement they would have to test one repelant at a time and wait to see the results before testing another repellant and the two people that drank mountain dew before the expirement, shouldn't drink it before the tests.
A)1.if pressure in the water heater is above the normal psi then the water heater will shoot
though your house like a rocket.
2. water heater at a normal PSI rate.
3.pressure of the water heater.
4.water heater shooting into the air like a rocket.
5.No, I do not think the experiment is controlled because they only tested one variable.
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.
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.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 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.
A: In the experiment we watched on myth busters the hypothesis was that if we put pressure on the water heater and put the tempeture up really high then the heater will explode. The control was a house that had the water heater that easy set at the right tempeture. The independent variable was the heater on high tempeture. The dependent variable was the house blowing up due to the heater exploding. Yes, I think this was a controlled experiment because it had a control, a hypothesis, and it was able to be tested. Everything a good experiment needs.
B: If I were to take the insect replant lab and change it so it only tested one variable I would have the 4 people not drink mountain dew. I would do this because then the experiment would only be testing the replant against the water and it would be a much more controlled experiment.
The Independent Variable is the pressure of the water heater. The Dependent Variable is the water heater shooting up like a rocket. The Control is a water heater under normal pressure so it is a controlled experiment. The hypothesis is if you increase the water pressure of a water heater then it will shoot up like a rocket.
I would change the the experiment then I wouldn't have any people drink or eat anything with sugar in it because it changes the results of the experiment.
A.) The hypothisis was if the preasure is pushing on the water heater then it will shoot through the roof and way up in the sky.
The control was the water heater.
IV- Water heater
DV- The amount of presure
yes this was a controlled experiment because they were testing to see if what happened really happened or if it was just a myth.
B.) I would have a placebo and have real one and record the reactions of the bugs.
A)1. Hypothesis- If the psi is extremely high, then the water heater will go straight through an average house roof.
2. The control in this expirement is a normal water heater at the normal pressure.
3. The independant variable in this expierement is the water pressure.
4. The dependent variable is the water heater exploding.
5. Yes I think that this is a controled expierement because there is a testable hypothesis.
B) 1. In order to change this to be a Controlled Expierement, then the two people who drank Mountain Dew would had to have not drank Mountain Dew, or the scientsts could have redone the expirement with completely different people.
What was the hypothesis? If you raise the psi on a water heater then the water heater shoots up like a rocket. What was the control? The control was the water heater that water pressure wasn't raised. What was the IV? the IV was the PSI being raised. What was the DV? the DV is the water heater shooting up like a rocket. Do you think this was a controlled experiment? Provide evidence to support your answer. Yes because the only thing they changed was the PSI.
A:
1. If you put a lot of pressure on a water tank then it will explode and go through the roof of a house.
2. The control was the water heater that they set aside.
3. The pressure that was put on the water heater.
4. The water heater.
5. Yes, because they had a control, a 2nd water heater.
B:
I would make sure that the people didn't drink anything that had any sugar in it or eat any thing 24 hours before the test and I would make sure that some of the people get water in there arm.
A)
If the Water heaters pressure is increased then the water heater will explode. The water heater is the control for the experiment. The iv is the the pressure of the water heater and the dv is the water heater eploding and shooting off into the air. I do believe that the experiment was a controled experiment because, the water heaters pressure was increased another degree higher till it exploded.
B) I would change it by making ALL people not have anything to drink and nothing to eat. And have only one person be sprayed with water but not knowing it
(Allison B,Core D)
Questions 1-5, A
1.If the PSI gets to high then the water heater will shoot like a rocket.
2.The control is a normal water heater at normal pressure.
3.The IV or cause was the increased PSI.
4.The DV or effect was the water heater shooting up like a rocket.
5. Yes, I think this is was a controlled experiment because they didn’t change the water heater. They controlled the type of water heater and the type of PSI they used.
Question B
I would do it like the steps below:
•Get 10 volunteers
•Get 10 bug repellants (including water and major brands)
•Have all 10 volunteers fast for 24 hours
•Test 1 repellant on 1 volunteer, do this for each volunteer/repellant
•Record the bites on each volunteer/repellant
•See which repellant worked best
A) If you rais the PSI in the te wter heater then it willn explode like a rocket.
The IV is the PSI in the water heater.
The DI is that it shot like a rocket.
B) I would tell the volenteers not to eat or drink shugary drinks atleast 12 hours before the experement.
Katelyn Evans
1. If the PSI goes really high then it will explode.
2. A water heater at normal PSI
3. Increase in PSI
4. Shot like a rocket
5. Yes, I think it is controlled because they had one control and controlled the PSI for the experiment heater.
b) I would change that everyone drinks only water.
A.
1. The hypothesis was if the PSI is increased then the tank would shoot skyward.
2. The control was the water heater.
3. The IV was the water heater.
4. The DV was the amount of PSI.
5. Yes this was a controlled experiment because there was a control to compare data too and there was enough data to compare the control to.
B. I would have all the test subjects drink pure water before the test. Half of the test subjects would get water sprayed on them and the other half would get the repellent.
A.) If you make the pressure higher than it is supposed to be on the water heatr then it will explode like a rocket. The control was the normal water heater with normal pressure. The IV was the increaded pressure that was on the water heater. The DI was the water heater that turned into a rocket. This was a controlled expeirement becaus they changed the pressure on one heater while keeping the other one the same and because they tested one thing at a time.
B.) I would chnge it so everyone only drank water and didnt eat anything. That way the only thing that can change is the bug spray. If you do this then you would only be testing one varriable at a time and it would be a controlled expeirement.
Jonathon Deifel Core D
1. If you add 350 pressure to the water heater then the water heater will go through the roof.
2. The control in this experiment was the normal water heater.
3. The independant variable was the water pressure.
4. The dependant variable was the water heater going through the roof.
5. Yes, I think this was a controlled experiment because they only tested one variable at a time.
B. If I were to change the insect repellent lab I would have only tested one insect repellent at time to make it a more controlled experiment.
A]The hypothesis is if the psi is higher than the water heater will go higher out of the roof.
B]The water heater that was normal.
C]The changed water heater.
D]The psi when it goes high.
E]Yes because they had a control to compare and contrast with the regular water heater.
A)We think it is a hoax. It is the placebo affect! When people know that they have the bracelet then their mind is telling them that its going to work so it does. When the tester knew when the people had the bracelet it worked but when he didn't know it didn't work.
B 1.The hypothesis is if you wear the bracelet it will give you better balance.
2. The other people that got fake cards.
3. The power balance band.
4. if it worked on your or gave you better balance.
5. yes it was an controlled experiment because they had a control and a placebo to compare results to.
6. they need to test if it is harm full or not.
3) It is important to test products scientifically because people will want to know if it actually works and is effective before they spend that much money on it.
a if you make the water preasure higher then it should be it will explode like a rocket. the controol was normal presuar on normal water heater. the iv is raising the water prasure. the dv is the water shooting up. i thing the control was the water heater because it never changed.
b i would have the people all only drink water so there is only one variable going on in the test
the hypothsis is if the water heater shots up in the air then the house will explod
the control is the amount of presure
the iv is the presure
the dv is the water heater
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