One and Two Variable Statistics | Texas Instruments TINSPIRECX

First Steps with TI-Nspire™

Tutorial 7: One- and two-variable statistics

Tutorial 7

One and Two Variable Statistics

One of the six core applications of TI-Nspire is Data & Statistics, the workspace for presenting, interpreting and manipulating statistical charts and graphs. This application works in combination with the Lists & Spreadsheet application and this tutorial uses the data that were entered as a spreadsheet at the beginning of Tutorial 6.

Shoe Sizes and Hand Spans

Start by locating in your Document the page that you created in the first part of Tutorial 6. There should be 20 or 30 pairs of (probably fictitious) data in columns A and B and at least 15 values in column C.

•List mshoe in column A represents male shoe sizes.

•List mhand in column B has widths of hand spans in cm (paired data with column A).

•List fshoe in column C represents female shoe sizes.

Charts with One Variable

To create a new page for the charts press c then select .

Randomly distributed points: no variables

have yet been assigned.

Move the cursor to the bottom of the screen where it says: Click to add variable. Press x.

A list of currently defined lists opens up, so use the Touchpad to select mshoe and press · or x.

Initially you will see a dot plot.

Press b1 to see the Plot Type menu, which gives nine types of plot. Because you have only defined a single numerical variable so far, there are only three alternative plots including a boxplot and a histogram.

Try these options now.

Data entered in Tutorial 6

Choosing a variable

Three plots for numerical data

Page 46

© 2012 Texas Instruments Education Technology

Image 46

Texas Instruments TINSPIRECX manual One and Two Variable Statistics, Shoe Sizes and Hand Spans, Charts with One Variable

Contents

First Steps About this document Contents Appendix TI-Nspire CX Keypad Layout Nothing on the screen? TI-Nspire DocumentsMemory Battery Life Charging the handheld Home Screen First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Documents, Problems and Pages Scratchpad Navigating Documents First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Contextual Menus Check list of some key points in Tutorial Calculator Application Basic operations History Lesson Approximate Calculations Templates Menu of maths templates Effect of changed settings Document settings dialog boxGetting Set Ways to define variables Some AlgebraUse of function notation Statistical Distribution Tables Calculator MenuLists of random integers Variables Linked to Documents List of defined variables Making Notes Why use Notes?Various text formatting Instructions Recording results Format sub-menu Splitting the ScreenWays to split the screen You must press /e and then b Interactive Notes An inserted comment Use of proof template and symbolsMore Options from the Notes Menu Use of Q+A template Asking Questions Check list of some key points in Tutorial Graphing Functions GraphingGraphs & Geometry Two Views Graphing View Open-hand cursor Grab and Drag PracticeChanging the Axes Grabbed tick mark on the axes Editing, Deleting or Hiding a Function Zoom settings Grabbed-sheet iconChanging f2 in the function history Trace picks out significant points Tracing GraphsPoints and coordinates Points of intersection Analyse Graph Menu Coordinates and labelled points Manually Moving Graphs Using SlidersAlternative icons Transformed graph and equation Sequence Plotting Check list of some key points in Tutorial Two Parallel Lines GeometryView for Plane Geometry Drawing the base of the triangle Construct the Triangle What’s grabbable?Many options in the Construction menu Measurement menu Making MeasurementsVariables and Text Storing the measurement as a variable Ready to grab a and slide it Tidying Up and Using AttributesDynamic Changes Changing the attributes of the triangle Area is now locked Unlocked/Unpinned Points B and C. Try Moving point B Check list of some key points in Tutorial Lists & Spreadsheet Entering Data as Lists Conflict resolution Using FormulaeOne way to enter a formula Typical Spreadsheet Actions Function Tables Capturing DataHand-made function table Simple function table Options for function tables Graph and table side by side Frequency Charts One and Two Variable Statistics Charts with One VariableShoe Sizes and Hand Spans Comparing Boxplots Charts for Categorical DataPie Chart displaying categorical data Upper quartile displayed Fitting a Line by Hand and Eye Charts with Two VariablesReady to add a 2nd variable Getting the Stats Drawing the Regression LineCalculated regression line Statistics Calculations menu Sets of statistics Dragging on the ChartsWorking with Frequency Data Effect of moving a point from here … … to here Texas Instruments Education Technology Check list of some key points in Tutorial Draw and Measure a Circle Multiple RepresentationsMeasured circle Two Scatterplots Setting up a scatter plot Data capture is under waySpreadsheet for Data Capture Collecting Just a Little Data Linear relationship Go to Town with Data CollectionFit a Straight Line Moving a straight line by hand Not a linear relationship Regression Different Approach to ScatterplotsBasic quadratic ready for fitting… … and dragged into place