BIOL 189 Exam 1 Graphing
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What is the
difference between a dependent variable and independent variable?
- Dependent variable (aka response)-
- variable that is measured: may respond to independent variable
- Independent variable (aka controlled
- or manipulated)-variable under control of the experimenter
What goes on
the x-axis(horizontal), independent or dependent?
Independent or controlled variable
What are the
general features of s figure or table and its caption?
Must have some quantitative data
- More flexible and visually oriented
- for complex information
Every axis should have a title
- Units must be specific on each axis,
- if applicable
- Caption is placed below figure/graph
- and contains a description
- Qualitative or categorical
- quantitative data
Best for small numbers of categories
- Every column (and, if appropriate,
- row) should have a title
Units must me specific
- Captions are places above the table
- and have a description
What types of
information are appropriate to show in a table? A scatter plot? A line plot? A
bar graph? A pie graph?
- Table: Qualitative or categorical quantitative
- Scatter plot: Quantitative continuous
- x- and y-axes
- Line plot: Quantitative continuous x-
- and y-axes
- Bar graph: Quantitative categorical or
- qualitative x-axis and quantitative continuous y-axis
- Pie graph: Categorical labels: measured variable
- sensibly expressed as part of a single whole (proportion)
quantitative data? Qualitative data? Categorical data? Continuous data?
- Quantitative data- order of values
- -categorical-groups which can be
Qualitative data-cannot be ordered
Essay Question: Lou was studying
the relationship between height at the shoulder and mass for many different
animals. He chose a set of animal
species to represent a range of heights, then weighed them.
-What are his independent and
-Specify whether each variable
is quantitative or qualitative? If they are quantitative, categorical or
-Graph the data using
appropriate figure. Don’t forget the
label for each axis and the caption.
(Animal 1 was 10cm tall and
weighed 5grams, Animal 2 was 25cm tall and weighed 13grams, Animal 3 was 50sm
tall and weighed 40 grams, Animal 4 was 100cm tall and weighed 120grams)
What would you like to do?
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