3. Data Analysis II Flashcards
eutrophication
excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.
covariance
a quantity measuring the extent of interdependence of variable quantities. unitless measurement between to variables ex. dissolved oxygen vs. chlorophyl – 0.48
Dissolved oxygen vs. Water temp – 0.54 leinnear relationships between the two variables draw the regression line.
Both are about 50%
standard deviation
is the square root of the variance
richness
when you have many different kinds of organisms
Three factors that affect dissolved oxygen in the water
Mechanical stirring, biological, and temperature (cold water holds more oxygen than warm) affects.
chlorophyll A
This is a good measure of photosynthesis
correlation
a quantity measuring the extent of interdependence of variable quantities. unitless measurement between to variables ex. dissolved oxygen vs. chlorophyl – 0.48
Dissolved oxygen vs. Water temp – 0.54 leinnear relationships between the two variables draw the regression line.
Both are about 50%
causation
the action of causing something: investigating the role of nitrate in the causation of cancer.
correlation is not causation
“Correlation is not causation” means that just because two things correlate does not necessarily mean that one causes the other. As a seasonal example, just because people in the UK tend to spend more in the shops when it’s cold and less when it’s hot doesn’t mean cold weather causes frenzied high-street spending.
richness
when you have many different kinds of organisms