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Bio lab

Terms in this set (21)

Name the 6 steps of the scientific method?
1. observation. 2. question. 3. hypothesis. 4. prediction. 5. experiment. 6. concultion
What is the difference between a prediction and a hypothesis?
the difference between a hypothesis and prediction
Hypothesis: "this happens because..."
Prediction: "if this/then..."
What is the purpose of an experimental group and a control group?
experimental group should see a change as a result of the independent variable. control group is a standardized independent variable, so as to set a basis for comparison
What are controlled variables? Why are they important?
they are controlled variables that are kept the same (i.e controlled) so they don't alter the outcome.
What is the purpose of replicates and replication, and large sample size?
An experiment must be repeated several times to increase the likelihood that the results are not due to chance. Thus, more consistent, reliable, and accurate.
On a graph, what goes on the x-axis, and what goes on the y?
the x-axis is horizontal and the y-axis is vertical.
What is the difference between an independent and dependent variable?
Independent is what you are changing, changing the outcome of what you are measuring
If a series of well-designed experiments does not support a hypothesis, what must happen?
what you are observing, depends on the independent variable
What is the difference between an observation and a scientific question. Provide an example.
A observation is objective and quantifiable, and a question must be well-defined and testable.
What is the difference between a hypothesis and a theory?
A hypothesis is a a pontenial explanation to a question, and a theory is a prediction or an "if/then" statement.
What are some limitations of the scientific method?
Limitations of the scientific method are claims that science cannot be applied to, i.e supernatural claims.
What does a refractometer measure, and what are its units?
a refractometer measures the percent of dissolved solids by weight in (Bx)
Does a refractometer measure the amount of light that goes into a substance?
No
Does a refractometer measure the amount of dissolved solids in a liquid?
Yes
We don't really talk about something being proven in science. Instead, we say hypotheses are either __________or _________
supported or unsupported
Are all scientific investigations hypothesis driven?
yes
What are two different kinds of graphs? When might we use one over an another?
Bar and line graph
What is a null hypothesis?
it is the hypothesis that the researcher is seeking evidence to disprove, and by default, support the hypothesis.
What is scientific hypothesis?
Testable and a proposed explanation
What is a scientific theory?
A hypothesis that has been repeatedly tested, and not validated and also the best explanation we currently have for a broad range of phenomena.
What is the difference between a controlled variable and a control group?
A controlled group is a set of items/organisms being tested/measured that do NOT have the independent variables changed, a control group is a variable that is standardised.
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