Vocab.
Hypothesis
Quantitative Data
Graphing
Lab Equipment
100
Define IV
Independent variable =
What is deliberately changed or manipulated in an investigation
100
How do you correctly write a hypothesis?
If the IV, then the DV.
100
Define accuracy
Accurate data is correct, meaning close to the accepted value.
100
What is a graph for?
It displays the data that was gathered in a scientific investigation.
100
What is a petri dish used for?
Culturing (growing bacteria)
200
Define DV
Dependent variable =
What changes in response to the IV; what is measured
200
In a hypothesis the __________________ variable is what is being tested, while the _________________ variable is the one being measured in response.
independent- dependent
200
Define Precision
Precise data is specific and consistent among trials.
200
What variable goes on the x-axis?
The independent variable
200
Which piece of glassware is never used for making measurements?
test tube
300
Constant
Constants (controlled variables) =
Aspects of an experiment that are kept constant/consistent
300
Describe how you could set up an experiment to test the hypothesis" If students eat a high-protein breakfast, then they will score higher on their biology test."
List your experimental groups, control group, and at least 2 constants you would need to have.
One class eats a high protein breakfast while the other does not.
Experimental group- breakfast group
Control group- non-breakfast group
Constants- Same test, same time given
300
Which of the measurements below is the most accurate?
A. Graduated cylinder - 80.6 mL C. Beaker – 48 mL
B. Erlenmeyer flask – 325 mL D. Beaker – 400 mL
(See picture)
Beaker- 48 mL
300
What variable goes on the y-axis?
The dependent variable
300
What is this??
(Beaker)
400
Experiment vs. Control Group?
Experimental group =
Group(s) being tested
Control group =
Standard/”normal” group used for comparison
400
Identify the independent and dependent variables in the hypothesis below:
a. If a player practices longer, then he will score more points in the
IV- practice time
DV- score
400
Which measurement tool in the lab is the most precise?
graduated cylinder
400
What are four things a good graph needs?
Data, Title, Labels, Key
400
What is this??
Flask
500
Make a qualitative, quantitative observation, and an inference.
Qualitative: The students are wearing blue. The students are smiling.
Qualitative: There are 9 students.
Inference: It is summer vacation! The students are headed to biology class!
500
Write a hypothesis predicting a relationship using the following:
IV- amount of caffeine DV- person's breathing rate
If the amount of caffeine increases, then the person's breathing rate will also increase.
500
Five students each used the same ruler to measure the length of the same pencil. Their measurements were: 15.33 cm, 15.34 cm, 15.33 cm, 15.33 cm, 15.34 cm. The actual length of the pencil was 15.85 cm. Explain whether the students’ measurements were accurate, precise, both, or neither. (2 pts)
The data is precise because the measurements are very similar (close to eachother).
500
Alexander was studying the effect of playing rock music on plant growth. One of the plants was exposed to rock music for 24 hours a day for a period of 6 weeks. Data on the growth of the plant was collected at the end of each week and plotted in a graph. Based on the data, which would be the MOST reasonable measurement at the end of a 6 week period?
(See picture)
6 dm
500
What is this?
Graduated Cylinder