You will need a calculator with the capability to do one- and two-variable statistics through correlation and simple linear regression. Many of you may already own such a calculator, so check your instruction manual before buying a new one. Most graphing calculators have this capability. For those of you who do need to buy a new calculator, I recommend the Sharp EL-506L ($20). I will hand out some brief instructions for the TI-81, -82, -83 and -85. Beyond this, it will be up to you to learn how to use your calculator.

1. Clear the lists
   2nd STAT DATA 2:Clrstat ENTER
2. Enter the data
   2nd STAT DATA 1:Edit
   Now enter the data followed by ENTER. For one-variable data leave the Y values as 1.
3. For one-variable data
   2nd STAT CALC 1:1-Var ENTER
   Note: there are two standard deviations given. The right one is to use Sx.
4. For two-variable data
   2nd STAT CALC 2:LinReg ENTER

1. Clear the L1 list. One way to do this is
   STAT 1:EDIT
   use up-arrow to move the cursor up to L1
   CLEAR ENTER
2. Enter the data in the L1 column. After clearing L1 the cursor should be in the first entry for L1. Now just type each entry followed by ENTER.
3. STAT CALC 3:Set Up (Use right-arrow to move the cursor over to CALC after you push the stat key.)
   Make sure that under 1-Var Stats, Xlist is L1 and Freq is 1. If not move the cursor to L1 (or 1) and push ENTER.
4. STAT CALC 1:1-Var Stats ENTER
   Use the up- and down-arrows to scroll through the results given. Note: there are two standard deviations given. The right one to use is Sx.
   
   If you want box plots or histograms follow the following steps.
   
   
5. 2nd STAT PLOTS 1:Plot1
   The first line should be ON
   Type should be the box plot or histogram icon
   Xlist should be L1
6. 2nd STAT PLOTS
   Make sure Plot2 and Plot3 are off. If not turn them off.
7. WINDOW (only for a histogram)
   Xmin = a number a little smaller than the smallest x-value
   Xmax = a number a little bigger than the largest x-value
   Xscl = the class width (i.e., the width of a bar)
   Ymin = 0
   Ymax = a number a little larger than the largest frequency
8. ZOOM 9:ZoomStat
   TRACE (optional) Use left- and right-arrows to move around the graph

1. Clear the L1 and L2 lists. One way to do this is
   STAT 1:EDIT
   use up-arrow to move the cursor up to L1
   CLEAR ENTER
   use right and up-arrow to move the cursor up to L2
   CLEAR ENTER
2. Enter the x-data in the L1 column. First move the cursor to the first entry in L1. Now just type each entry followed by ENTER.
3. Enter the y-data in the L2 column. Use the right-arrow to move to L2.
4. STAT CALC 3:Set Up (use the right-arrow to move the cursor over to CALC after you push the STAT key.)
   Make sure that under 2-Var Stats, Xlist is L1, Ylist is L2 and Freq is 1.
5. STAT CALC 9:LinReg(a+bx) ENTER
   This gives you values a, b and r. Note: you can use 5:LinReg(ax+b) and get the same answer. The only difference is that the roles of a and b are interchanged.
   
   To get a scatter plot, follow these steps.
   
   
6. WINDOW. Set Xmin a little bit less than the smallest x-value and Xmax a little bit more than the largest x-value. Likewise for Ymin and Ymax.
7. 2nd STAT PLOT 1:Plot1. Set type to scatterplot (the first icon). Be sure Plot1 is on, Xlist is L1 and Ylist is L2.
8. GRAPH.

1. Clear the L1 list. One way to do this is
   STAT 1:EDIT
   use up-arrow to move the cursor up to L1
   CLEAR ENTER
2. Enter the data in the L1 column. After clearing L1 the cursor should be in the first entry for L1. Now just type each entry followed by ENTER.
3. STAT CALC 1:1-Var Stats ENTER
   Use the up- and down-arrows to scroll through the results given. Note: there are two standard deviations given. The right one to use is Sx.

1. Clear the L1 and L2 lists. One way to do this is
   STAT 1:EDIT
   use up-arrow to move the cursor up to L1
   CLEAR ENTER
   use right and up-arrow to move the cursor up to L2
   CLEAR ENTER
2. Enter the x-data in the L1 column. First move the cursor to the first entry in L1. Now just type each entry followed by ENTER.
3. Enter the y-data in the L2 column. Use the right-arrow to move to L2.
4. 2nd CATALOG (bottom row) use the down-arrow to DiagnosticOn ENTER ENTER. You need to do this step if you aren't getting r in the next step.
5. STAT CALC 8:LinReg(a+bx) ENTER
   This gives you values a, b and r for the list L2 (the y-variable) regressed on the list L1 (the x-variable). To switch the roles of the 2 lists (i.e., the 2 variables), type
   STAT CALC 8:LinReg(a+bx) 2nd L2, 2nd L1 ENTER
   This gives the list L1 regressed on L2.
   (STAT CALC 8:LinReg(a+bx) X-list, Y-list ENTER)

1. Clear the lists.
   STAT EDIT ENTER ENTER CLRxy

   Now enter the data followed by ENTER. For one-variable data leave the y-values as 1.

   For one-variable data
   STAT CALC ENTER ENTER 1-Var
   Note: there are two standard deviations given. The right one to use is Sx.

   For two-variable data
   STAT CALC ENTER ENTER LinReg