data and the ti nspire cx--camt 2017

January 26, 2018 | Author: api-292061267 | Category: Regression Analysis, Correlation And Dependence, Spreadsheet, Menu (Computing), Mathematics
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Data  and  the  TI-­‐NspireTM  CX   Entering  Data  and  Determining  Trend  Lines  and  Regressions   1. Open   a   new   TI-­‐Nspire   CX   document   and   choose  “Lists  and  Spreadsheets”.     2. Enter  an  appropriate  title  for  the  independent   and   dependent   values   in   the   top   row   of   the   page,  next  to  the  “A”  and  “B”  column  headings.     3. Enter   the   data   in   these   columns,   making   sure   that  there  is  the  same  number  of  data  values  in   each  column.      

Figure  1

4. When   you   finish   typing   all   data   values,   make   sure   that   the   cursor   is   blue   and   in   one   of   the   columns  containing  data.    (See  Figure  1)  



Figure  2

  5. Press  “Menu”    “Data”  “Quick  Graph.”     (See  Figure  2)     6. Determine   the   appropriate   independent   and   dependent  values.    Move  the  cursor  just  below   the   x   axis   and   press   “Click”   to   select   the   independent  term,  and  move  to  just  to  the  left   of   the   y-­‐axis,   then   press   “Click”   to   select   the   dependent  term.    (See  Figure  3)     7. Next,   press   “Menu”   “Analyze”   “Add   Moveable   Figure  3 Line”  (See  Figure  4)    

Figure  4

    8. A  random  line  will  be  placed  on  the  graphed   data.     9. When  the  cursor  is  moved  to  the  center  of  this   line,  the  cursor  takes  the  form  of  a  cross.  When   you  press  and  hold  “Click”  to  grab  the  line  and   then  slide  your  finger  around  the  touchpad,  the   line  will  be  translated.  Press  “Click”  again  to   release  the  grab  feature.   10.  When  the  cursor  is  moved  to  an  end  of  the  line,   Figure  5 the  cursor  becomes  a  broken  circle.  When  you   press  and  hold  “Click”  to  grab  the  line  and  then   slide  your  finger  around  the  touchpad,  the  line   will  be  rotated.  (See  Figure  5).    Press  “Click”  again   to  release  the  grab  feature.   11. Adjust  the  moveable  line  as  appropriate  to  create   a  trend  line  so  that  you  can  make  predictions   based  on  your  data.   12.  If  you  cannot  see  the  entire  equation,  hover  over   the  line  and  press  and  hold  “Click”  to  grab  the   equation  and  move  it  to  a  convenient  location  or   press  “Doc”  “Page  Layout”  “Ungroup”  to  change   Figure  7 the  split  screen  to  two  separate  pages.   13.  Press  “Menu”  “Analyze”  “Show  Regression”  (See   Figure  6)  and  choose  the  appropriate  regression   equation  (See  Figure  7)    

Figure  6  


Determining  a  Regression  Equation  with  the  Correlation  Coefficient         1. Open  a  new  TI-­‐Nspire  CX  document  and  choose     “Lists  and  Spreadsheets”.         2. Enter  an  appropriate  title  for  the  independent     and  dependent  values  in  the  top  row  of  the  page,   next  to  the  “A”  and  “B”  column  headings.  


  3. Enter  the  data  in  these  columns,  making  sure   that  there  is  the  same  number  of  data  values  in   each  column.      


Figure  1

4. When  you  finish  typing  all  data  values,  make  sure   that  the  cursor  is  blue  and  NOT  in  one  of  the   columns  containing  data.    (See  Figure  1)       5. Press  “Menu”    “Statistics”  “Stat  Calculations,”   select  the  appropriate  regression,  and    press  the   arrows  at  the  end  of  the  “X  List”  and  “Y  List”   fields  in  order  to  select  the  appropriate   independent  and  dependent  titles.       (See  Figure  2)     st 6. Make  sure  that  the  “1  Result  Column”  selected   does  not  contain  a  column  name  where  your   data  is  located.      



Figure  2

7. The  regression  equation  will  be  displayed.    Notice   the  location  of  the  correlation  coefficient  “r”.     (See  Figure  3)  


Figure  3

    Do  you  want  to  adjust  a  point  on  the  graph  and/or  List?    On  the  graph,  move  your  cursor  and  hover  the  point  in  question.  Then   press  and  hold  “Click”    and  slide  your  finger  across  the  TouchPad  to  adjust  the  location  of  the  point.       OR,  on  the  List  and  Spreadsheet,  double  click  on  the  incorrect  coordinate  in  the  List  and  retype  with  the  value  that  you  want.     With  either  method,  when  you  make  a  change,  the  corresponding  regression  equation  will  change  as  well.  

CAMT  2017  Session  2171  The  TI-­‐NspireTM  CX  Technology—Activities  for  Beginners     Valerie  Hudson                 Texas  Instruments  Instructor


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