Texas Instruments TINSPIRECX manual Texas Instruments Education Technology

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First Steps with TI-Nspire™

Tutorial 7: One- and two-variable statistics

Press b411 to start the One-Variable Statistics wizard, again choose 1 list (remember multiple lists are for when you want to calculate statistics for multiple lists at the same time).

This time we set the X1 List to be ‘gshoe but change the Frequency List from 1 to ‘gfreq, and set the Results Column to be c (which is the first empty column).

This gives you the summary statistics for this grouped data – Notice the mean comes out of to be just over 6, which matches original data (as the shoe-sizes go from 4 to 8).

We can also graph this data. This can be achieved from either the Lists & Spreadsheet page by pressing b35 to insert a Summary Plot, or from a Data and Statistics page by pressing b25 to insert an X Variable with Frequency. We will use this second approach now, so create a new Data and Statics page by pressing c then selecting .

Then press b25, this will give you the Frequency

Plot wizard.

This will give you the following graph. This can also be displayed as a box plot by pressing b12.

If you are dealing with grouped data you may need to adjust the Bin Settings by pressing b222.

Save your document as FirstStepsComplete, so you can return to this if you want at a later date.

© 2012 Texas Instruments Education Technology

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Contents First Steps About this document Contents Appendix TI-Nspire CX Keypad Layout TI-Nspire Documents Nothing on the screen?Memory 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 TemplatesDocument settings dialog box Effect of changed settingsGetting Set Some Algebra Ways to define variablesUse of function notation Calculator Menu Statistical Distribution TablesLists of random integers List of defined variables Variables Linked to DocumentsWhy use Notes? Making NotesVarious text formatting Instructions Recording results Splitting the Screen Format sub-menuWays to split the screen You must press /e and then b 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 cursorZoom settings Grabbed-sheet icon Editing, Deleting or Hiding a FunctionChanging f2 in the function history Points of intersection Tracing GraphsPoints and coordinates Trace picks out significant pointsCoordinates and labelled points Analyse Graph MenuUsing Sliders Manually Moving GraphsAlternative icons Transformed graph and equation Sequence Plotting Check list of some key points in Tutorial Drawing the base of the triangle GeometryView for Plane Geometry Two Parallel LinesWhat’s grabbable? Construct the TriangleMany options in the Construction menu 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 & SpreadsheetUsing Formulae Conflict resolutionOne way to enter a formula Typical Spreadsheet Actions Capturing Data Function TablesHand-made function table Graph and table side by side Simple function table Options for function tablesFrequency Charts Charts with One Variable One and Two Variable StatisticsShoe Sizes and Hand Spans Upper quartile displayed Charts for Categorical DataPie Chart displaying categorical data Comparing Boxplots Charts with Two Variables Fitting a Line by Hand and Eye Ready to add a 2nd variable Drawing the Regression Line Getting the StatsCalculated regression line Statistics Calculations menu 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 Multiple Representations Draw and Measure a CircleMeasured 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 relationshipDifferent Approach to Scatterplots RegressionBasic quadratic ready for fitting… … and dragged into place