Vocab
IV/DV
Experimental/Control Group
Drawing Conclusions
Observation vs. Inference
100
What a scientists wants to know or a problem they want to solve. Usually starts with "how"
Question
100
Identify the IV in the following hypothesis: If I eat more sugar, then my heart rate will increase.
What is the amount of sugar
100
Belle is testing how sugar affects attention span. She gives 10 kids 1/2 cup sugar and gives 10 kids no sugar. Which is her experimental group?
What is the group receiving a half cup of sugar
100
Javier is designing an experiment. He develops a question and a hypothesis. Then, he writes his conclusion without doing tests. Is his study valid?
NO - he needs to collect data
100
Uses senses (see, hear, touch, smell, taste) to make noticing.
Observation
200
This is what the scientist thinks is going to happen. (Always written in If/Then format!)
What is a hypothesis
200
Identify the dependent variable in the following hypothesis:
If I feed my cat more treats, then she will gain weight.
What is weight.
200
Dr. Laura gives 30 people an antibiotic and gives 30 people a sugar pill (placebo).
What is the control group?
What is the sugar pill (placebo)
200
Is one trial enough? Why or why not?
NO
200
Conclusion based on an observation.
Inference
300
What is the general pattern of a graph or table called?
Trend
300
Identify the IV in the following experiment: Jerry wants to know how brushing your teeth affects cavities.
What is brushing teeth
300
Rakan wants to know how drinking caffeine affects test scores.
What would be the control group in this experiment?
Drinking no caffeine before the test
300
Which of the following would improve reliability of an experiment?
a. Look at other scientists work.
b. Make a different hypothesis.
c. Repeat the trials many times.
d. Re-write the conclusion.
c. Repeat many times
300
There is a tree and a rabbit.
Observation
400
This is the variable that scientists change in an experiment.
What is the independent variable (IV)
400
Variable that goes on x axis
Independent Variable
400
Rakan wants to know how drinking caffeine affects test scores. What could two experimental groups be in this experiment?
Various answers: Drink coffee, drink soda Drink coffee, drink tea Drink various amounts of ...
400
The analysis of data gathered during a particular experiment is necessary in order to:
(1) formulate a hypothesis for that experiment
(2) develop a research plan for that experiment
(3) design a control for that experiment
(4) draw a valid conclusion for that experiment
4) Draw a valid conclusion
400
It is summer.
Inference
500
Effect or what is measured in an experiment.
Dependent Variable (DV)
500
Variable that goes on the y axis.
Dependent Variable
500
Jake has one person run .5 miles, 1 mile, and 1.5 miles and then measures their heart rate. Why is this experiment invalid?
No control group
500
An experiment can only be accepted if...
a. the data is organized correctly
b. the results can be replicated by other scientists.
c. there was no control group
d. there is one trial only
b) Must be replicated by other scientists.
500
IIt is about to rain.
Inference