There are always how many charts and graphs on the ACT?
Each passage has how many questions associated with it?
It's best to do what when looking at a chart and graph passage?
Scan the passage, chart, and graph and go straight to the questions.
Keep track of...?
Variables, units, and trends in charts.
The first step when looking at a chart and graph passage is?
What is a variable?
A quantity that has some type of value.
What are the two types of variables on the ACT?
Independent and dependent variables.
Sometimes graphs include...?
percentages as measurements.
Sometimes the wrong answers have..?
The wrong units.
A conversion between..?
units sometimes has to be made.
What are the four types of coordinate graphs?
Linear, graphs with curves, scatter diagrams, and flat lines.
In a coordinate graph, the x-axis represents..?
the independent variable (manipulated variable)
In a coordinate graph, the y-axis represents..?
the dependent variable (the variable affected by the change in the independent variable)
A point on a graph represents..?
a value for the independent and dependent variable.
When looking at graphs, remember to..?
look at what the variables are, how they're measured, and how they're related.
The points follow a straight line.
A positive linear relationship
an increase in x leads to an increase in y
A negative (inverse) linear relationship
an increase in x leads to a decrease in y
Graphs with curves
For every increase in x, the y-values become larger
The y-values in graphs with curves...
If a graph is curved, that means..?
the amount y changes with with each change in x is different at different points on the graph.
Scatter diagrams contain..?
A best-fit line.
A best-fit line on a scatter diagram means..?
The average of all the points on the graph when lined up
Tells what the points would look like if they were averaged and lined up (a straight line) and how they really look on the graph (scattered)
No relationship between variables; the two elements plotted on the graph have no effect on each other
A flat line is used to graph..?
data in which there is no change.
When scanning a table,..?
first look at the variables.
When scanning an illustration,..?
look at the variables.
The second step when scanning a chart or graph passage is..?
Identify the question type.
How many basic question types are there?
What is the first question type?
Look It Up
Look it up questions
identify the piece of information needed.
Look it up questions test the ability of...
understanding the figures.
What is the second question type?
have a slightly deeper understanding of the passage.
What is the third question type?
presented with new situation and asked to apply the concepts provided in the passage.
The third step when scanning a chart or graph passage is..?
To estimate values on a graph between two known values
To project or expand known data into an area not known