Variables
The independent variable in this question:
Does penicillin prevent infection?
penicillin
What is the purpose of a hypothesis?
To predict what would happen in an experiment
+100 to have something to test against
In a "Because" hypothesis, which part explains the dependent variable's response?
(how the dependent variable responds) because (Independent variable changing one way)
Dependent Variable in the following the Statement
Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of an experiment.
Number of flowers grown
What can we find in the results?
Charts and graphs
Where to the variables fit in the "If____, Then_______" hypothesis formula?
If IV changes, then DV responds
Dependent Variable and Independent Variable in the following:
One tank of goldfish is fed the normal amount of food once a day, a second tank is fed twice a day, and a third tank four times a day during a six week study. The fish’s body fat is recorded daily.
Food amount-IV
Body Fat/weight of fish-DV
What is the next step after Getting the results in the scientific method?
What is a "Due To..." Hypothesis for the following statement?
One tank of goldfish is fed the normal amount of food once a day, a second tank is fed twice a day, and a third tank four times a day during a six week study. The fish’s body fat is recorded daily.
Due to goldfish being fed four times a day, the body fat of the fish would increase.
Control Variable in the following statement
You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives regular water. After a two-week period, the height is measured.
amount of water, temperature, light, two weeks etc.
Not Sunflower or salt
What is found in the experiment portion of a ACT article?
How to Guide
Write a hypothesis in the "If... Then..." formula
Three wax palm trees are kept at different humidity levels inside of a greenhouse for 12 weeks. One tree is left outside in normal conditions. Height of the tree is measured once a week.
If the humidity is high then the height will increase faster
Control Variable in the following
Do different types of music affect how well a person can do his/her homework?
Time of day, class homework is in, etc
not music types or grade
Why do we need to have a constant?
Keep other factors from affecting the Dependent Variable
Write a "Because" hypothesis with the following.
You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives regular water. After a two-week period, the height is measured.
The sunflowers will grow less because the salt levels are high