Texas Instruments TINSPIRECX manual Dragging on the Charts, Working with Frequency Data

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It is also possible to arrange side-by-side comparisons of corresponding summary statistics for two or more data sets and this makes drawing inferences from the statistics very quick and very clear. The best way to do this is to select more than one list above.

Dragging on the Charts

An interesting feature is the ability to drag plotted points around charts, thus changing the original data. Go back to the page on which you created the scatterplot for male hand spans and shoe sizes. You left the plot showing the y=mx+b regression line and equation.

First Steps with TI-Nspire™

Tutorial 7: One- and two-variable statistics

Sets of statistics

Move the cursor to a point very near the line of best fit. The cursor changes to a hand with a finger pointing upwards when it is pointing to a data point. Click and hold x.

Move the cursor to investigate the effect that moving this point has on the regression line. Below, the point has been moved to the top of the screen for maximum effect.

The effect of moving a point from here …

… to here.

This shows the effect of changing a single hand-span value from 21cm to 32cm

Working with Frequency Data

In the previous tutorial we entered some grouped data for shoe sizes. We will now explore some of the ways we can work with that data using TI-Nspire. Start by returning to the Lists & Spreadsheet page we created in the previous tutorial.

We can use the same process we used above to find summary statistics for this frequency data.

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© 2012 Texas Instruments Education Technology

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Contents First Steps About this document Contents Appendix TI-Nspire CX Keypad Layout Memory TI-Nspire DocumentsNothing on the screen? Battery Life Charging the handheldHome Screen First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Documents, Problems and Pages ScratchpadNavigating Documents First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Contextual Menus Check list of some key points in Tutorial Calculator Application Basic operationsHistory Lesson Approximate CalculationsTemplates Menu of maths 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 Variables Linked to Documents List of defined variablesVarious 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 Interactive Notes An inserted comment Use of proof template and symbolsMore Options from the Notes Menu Use of Q+A templateAsking Questions Check list of some key points in Tutorial Graphing Functions GraphingGraphs & Geometry Two Views Graphing ViewOpen-hand cursor Grab and Drag PracticeChanging the Axes Grabbed tick mark on the axesChanging f2 in the function history Zoom settings Grabbed-sheet iconEditing, Deleting or Hiding a Function Trace picks out significant points Tracing GraphsPoints and coordinates Points of intersectionAnalyse Graph Menu Coordinates and labelled pointsAlternative icons Transformed graph and equation Using SlidersManually Moving Graphs Sequence Plotting Check list of some key points in Tutorial Two Parallel Lines GeometryView for Plane Geometry Drawing the base of the triangleMany options in the Construction menu What’s grabbable?Construct the Triangle Measurement menu Making MeasurementsVariables and Text Storing the measurement as a variableReady to grab a and slide it Tidying Up and Using AttributesDynamic Changes Changing the attributes of the triangleArea is now locked Unlocked/Unpinned Points B and C. Try Moving point BCheck list of some key points in Tutorial Lists & Spreadsheet Entering Data as ListsOne way to enter a formula Typical Spreadsheet Actions Using FormulaeConflict resolution Hand-made function table Capturing DataFunction Tables Simple function table Options for function tables Graph and table side by sideFrequency Charts Shoe Sizes and Hand Spans Charts with One VariableOne and Two Variable Statistics Comparing Boxplots Charts for Categorical DataPie Chart displaying categorical data Upper quartile displayedReady 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 Sets of statistics Dragging on the ChartsWorking with Frequency Data Effect of moving a point from here … … to hereTexas Instruments Education Technology Check list of some key points in Tutorial Measured circle Multiple RepresentationsDraw and Measure a Circle Two Scatterplots Setting up a scatter plot Data capture is under waySpreadsheet for Data Capture Collecting Just a Little DataLinear relationship Go to Town with Data CollectionFit a Straight Line Moving a straight line by hand Not a linear relationshipBasic quadratic ready for fitting… … and dragged into place Different Approach to ScatterplotsRegression