Measurement, Precision, and Accuracy Flashcards
Study Study Study
Qualitative 2 things
- Involves 5 senses
- Written as adj. (hot, light, fuzzy)
Quantitative 2 things
- Involves measurement or numbers
- counting
What does quantitative data often include?
statistics
numerical data
scientific experiments
surveys
organized observations
Qualitative data often includes these 3 things
- open-ended interviews
- case studies
- lose observations
Compare and contrast qualitative and quantitative data.
Quantative
-objective
-concrete
- measured
Qualitative
- Subjective
- Interpretive
- Descriptive
What does the accuracy of your data depend on?
the reliability of the tool you are using and the tool reading that tool.
The area is measured in
M^2
CM^2
km^2
Formula for Area
Length x Width
Volume is measured in
Liquids- Liters or Milliliters (mL)
Solids- M^3 CM^3
Formula for volume
V= Length x Width x Height
The formula for density is
Density= Mass/Volume
1 cm^3=
1 mL
def of Accuracy
How close measurement is to true value
def. of Precision
how close measurements are to each other
def. of Significant Figures
These are all the digits known to us from our measuring tools plus one additional estimated digit
What is the def. of a scientific model
A representation of a system of ideas, events, or processes
what are the 3 types of scientific models
- Conceptual
- Mathematical
-Physical
Physical scientific model def.
smaller and larger of the things being studied
Mathematical scientific model def.
sets of data that consider many factors to represent a phenomenon usually done on a computer
Conceptual scientific model def.
tie together ideas to explain a phenomenon or event
Benefits of scientific models
- Better understanding of things we cannot normally see (too big like a solar system or too small like a cell)
- give us an understanding of phenomena
- helps us to notice patterns
Limitations of scientific models
-things that make the model not completely accurate
- No model can possibly explain every detail of scientific phenomena
(sometimes oversimplified like photosynthesis)
What are the 3 types of investigations
Descriptive (identifying)
Comparative (compare and contrast)
Experimental (scientific method)
Independent variable def.
What you change in an experiment
Dependent variable def.
Response to what you are changing
Control Group def.
The group in a lab for comparison
Why is a control group important
to see if IV is truly having an impact
Difference between laws and theories + example
theory- explnations and observations built on knowledge from experiments. Based on time/they can also change over time (Big Bang)
law - a rule that is known in science and describes a pattern in nature. / not why something happen just what happens (law of conservation of energy)
How do you find an independent and dependent variable in a hypothesis?
If IV, then DV
What makes a hypothesis valid
It must be testable and include IV then DV format
what are constants
things that are the same in an experiment
Which of the three types of investigations must have a hypothesis, an independent variable, and a dependent variable?
Experimental
What are the 3 different types of models + example
Mathematical- chart or weather map
Physical-cell model or globe
Conceptual- Water cycle
2 limitations of models
- Can’t act or behave like the real thing
- sometimes oversimplified
3 benefits of models
- Better understanding of things we cannot normally see
-helps us to notice patterns
-gives us an understanding of phenomena
In science, we use line graphs quite often. In a line graph, we do not connect the dots. Instead, we use
____________
Line of best fit
Practice finding variables from experiments
yesyeysyeysyesyeysyse
know how to make a graph ( look in notes)
ok
