Texas Instruments TI-Nspire, Manual Book, Page: 621 / 876

Using Data & Statistics 609
2. Choose the format for the scale of the histogram.
–
Frequency
- displays data based upon the number of values that
occur within each bin (interval) on the histogram. This is the
default data representation when you create a histogram.
–
Percent
- displays data in the histogram by each group’s percent
value of the whole data set.
–
Density
- displays data based upon the density of each value
within the variable.
3. Click
OK
to complete the scale change.
Creating a normal probability plot
A normal probability plot shows one set of data against the
corresponding quartile (
z ) of the standard normal distribution. You can
use normal probability plots to judge the appropriateness of the normal
model for your data.
1. Choose or create the data you want to use for a normal probability
plot. Use a named list from Lists & Spreadsheet or Calculator.
2. Plot the data in one of the following ways:
– Create a dot plot by selecting a column and choosing
Quick
Graph
.
– Add a Data & Statistics work area. Click the Add Variable region
on an axis and select the data list name to plot the variable.
3. On the
Plot Types
menu, select
Normal Probability Plot
.
The data graphs in the Data & Statistics work area. You can examine
the graph to compare the normal variable against the quartile.
4. Explore the data represented in the normal probability plot.
– Hover over a data point to display its value.
– Click to select a data point. Click again to deselect it.
– Click on multiple data points to select them.
– Activate the Graph Trace tool and press
¡
or
¢
to move across the
data points and display values.
Creating a Scatter Plot
A scatter plot shows the relationship between two sets of data. You can
also plot a scatter plot by using the Quick Graph tool in the
Lists & Spreadsheet application.