Final Flashcards
(38 cards)
Science
a method, or process, used to investigate the
natural world.
Deductive Reasoning
is used to solve problems with
“known” parameters.
Inductive Reasoning
is used to generate
new information or principles.
Observation
data obtained with the five senses
of a single event
Generalization
A generalization is a pattern or regularity you discern from a set of similar or related observations
Inference
An inference is a reasonable, but tentative consequence or conclusion you deduce from an observation or generalization (or both) combined with your prior knowledge and experience - what you think it all might mean.
Qualitative Observation
Descriptive; what something is like
Quantitative Observation
Numeric; how many; relates to a quantity
The Scientific Method
- Observation – an observation is a single perceived event.*
- Hypothesis – a hypothesis is a proposition that might be true.
a. A hypothesis comes from an educated guess about the
pattern or process (generalizations) underlying potentially
related observations.
b. Alternate hypotheses – are other possible, but less likely
explanations for observed phenomenon.
c. All versions of the scientific method involve forming
hypotheses. - Predictions – General consequences that
might be observed if a hypothesis is
correct. Frequently more specific than a
hypothesis. - Testing – The use of experiments to
evaluate predictions and thus accept or
reject the underlying hypotheses. All
versions of the scientific method involve
testing. - Conclusion – A conclusion is drawn from
the results of an experiment. Rejected
hypotheses are discarded and hypotheses
that are not rejected are carried forward
into future work. A series of accepted,
related hypotheses are the basis for a
theory.
Theory
is a unifying explanation for a broad range of observations.
Independent Variable IV
the one variable that you are changing
Dependent Variable DV
the one variable you think is affected by the IV You are experimenting to see if there is a relationship between IV and DV
Control Variables
all of the other variables that are kept the same
Hr
is the hypothesis stating that there is a difference caused by the independent variable, as to its effect on the dependent variable. Note, the Hr does not state the nature of the difference, but only that there is a difference.
Null Hypothesis (N0)
is the hypothesis of no difference; there is NO difference caused by the independent variable as to its effect on the dependent variable.
Alternate Hypothesis (Ha1)
describes one nature of the difference alluded to in the Hr and is the hypothesis which we expect to occur (consistent with our
prediction/conjecture).
2nd alternative hypothesis (Ha2).
describes a different (and
generally opposing) nature of the difference alluded to in the Hr and is the hypothesis which we DO NOT expect to occur. Generally, Ha1 and Ha2 describe opposing responses (increase vs. decrease, positive correlation vs. negative correlation, etc.).
Variable
is any aspect of nature that is capable
of changing.
Correlation
two variables behave in an interrelated manner:
the value of one variable predicts the value of the
other variable.
Continuos Variable
Infinite number of measurements between any two points. (line graph).
Discrete Variable
Non-overlapping categories; no in-between. (column graph).
Interpolation
Estimating among known data points
Extrapolation
Estimating beyond known data points
Dermal Tissue
forms the outermost layer.