Texas Instruments TINSPIRECX manual Comparing Boxplots, Charts for Categorical Data

Page 47

First Steps with TI-Nspire™

Tutorial 7: One- and two-variable statistics

Display the boxplot and then move the cursor over the chart. You will be able to see the median, quartiles, maximum and minimum values and, possibly, outlier values.

Upper quartile displayed

Comparing Boxplots
This boxplot can be compared with a similar one representing
the female shoe sizes by displaying them, one above another.
To do this we add a second X Variable by pressing b24,
this will give you the choice of available lists.
This time select fshoe. The result is two side by side box plots
that can easily be compared.
This method can be used to add more box plots, up to five or
six can be easily compared on the same screen.	Comparing shoe sizes

Charts for Categorical Data

Create a new Data & Statistics page and choose the variable mshoe for the x axis.

This variable contains a list of numerical data but they could also be thought of as categorical data, in which case it would be appropriate to use a Pie Chart. By using the option Force Categorical X in the Plot Properties menu you can force the handheld to treat the data in this way. Notice the way in which the labels on the axis change.

A Pie Chart displaying categorical data

Now you can use the Plot Type menu to choose Pie Chart.

It is also possible to enter non-numerical categorical data in a Lists & Spreadsheet page, e.g., favourite pets, sandwich fillings etc. Such data must be entered in quotation marks by pressing /r(Ó).

© 2012 Texas Instruments Education Technology

Page 47

Image 47

Contents First Steps About this document Contents Appendix TI-Nspire CX Keypad Layout Memory TI-Nspire DocumentsNothing on the screen? Charging the handheld Battery LifeHome Screen First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Scratchpad Documents, Problems and PagesNavigating Documents First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Contextual Menus Check list of some key points in Tutorial Basic operations Calculator ApplicationApproximate Calculations History LessonMenu of maths templates TemplatesGetting Set Document settings dialog boxEffect of changed settings Use of function notation Some AlgebraWays to define variables Lists of random integers Calculator MenuStatistical Distribution Tables List of defined variables Variables Linked to DocumentsVarious text formatting Instructions Recording results Why use Notes?Making Notes Ways to split the screen You must press /e and then b Splitting the ScreenFormat sub-menu Use of Q+A template An inserted comment Use of proof template and symbolsMore Options from the Notes Menu Interactive NotesAsking Questions Check list of some key points in Tutorial Graphing View GraphingGraphs & Geometry Two Views Graphing FunctionsGrabbed tick mark on the axes Grab and Drag PracticeChanging the Axes Open-hand cursorChanging f2 in the function history Zoom settings Grabbed-sheet iconEditing, Deleting or Hiding a Function Points of intersection Tracing GraphsPoints and coordinates Trace picks out significant pointsCoordinates and labelled points Analyse Graph MenuAlternative icons Transformed graph and equation Using SlidersManually Moving Graphs Sequence Plotting Check list of some key points in Tutorial Drawing the base of the triangle GeometryView for Plane Geometry Two Parallel LinesMany options in the Construction menu What’s grabbable?Construct the Triangle Storing the measurement as a variable Making MeasurementsVariables and Text Measurement menuChanging the attributes of the triangle Tidying Up and Using AttributesDynamic Changes Ready to grab a and slide itUnlocked/Unpinned Points B and C. Try Moving point B Area is now lockedCheck list of some key points in Tutorial Entering Data as Lists Lists & SpreadsheetOne way to enter a formula Typical Spreadsheet Actions Using FormulaeConflict resolution Hand-made function table Capturing DataFunction Tables Graph and table side by side Simple function table Options for function tablesFrequency Charts Shoe Sizes and Hand Spans Charts with One VariableOne and Two Variable Statistics Upper quartile displayed Charts for Categorical DataPie Chart displaying categorical data Comparing BoxplotsReady to add a 2nd variable Charts with Two VariablesFitting a Line by Hand and Eye Calculated regression line Statistics Calculations menu Drawing the Regression LineGetting the Stats Effect of moving a point from here … … to here Dragging on the ChartsWorking with Frequency Data Sets of statisticsTexas Instruments Education Technology Check list of some key points in Tutorial Measured circle Multiple RepresentationsDraw and Measure a Circle Collecting Just a Little Data Setting up a scatter plot Data capture is under waySpreadsheet for Data Capture Two ScatterplotsMoving a straight line by hand Not a linear relationship Go to Town with Data CollectionFit a Straight Line Linear relationshipBasic quadratic ready for fitting… … and dragged into place Different Approach to ScatterplotsRegression