Statistical Methods STA 2023
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This 4 page Class Notes was uploaded by Winnifred Macejkovic on Thursday October 29, 2015. The Class Notes belongs to STA 2023 at Valencia College taught by Staff in Fall. Since its upload, it has received 12 views. For similar materials see /class/231203/sta-2023-valencia-college in Statistics at Valencia College.
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Date Created: 10/29/15
Working with TwoVariable Data on the T8382 This paper will discuss using the TI83 to display and analyze data First we will look at the mechanics of using the calculator to get a plot Then we will discuss some methods of tting a curve to the data and measuring the quality of the t Editing Data To edit data use the STAT key Then select ltEDITgt from the menu There are siX lists L1 L2 L6 that can be used to store data Use the cursor keys to move from list to list and up and down in a list Erasing Data In the rst picture on the right there is data in L1 and L2 To erase this data move the cursor over the name of the list at the top of the screen see rst picture Then press Do the same for each list The result is the second picture Baus Lang Feb 1995 page 1 Entering New Data L1 L2 L To enter data move the cursor to the place in the list quotquotquotquotquot quot you want the value type the value and press Note that the value is not put in the list until after the 839 1 1 key 1s pressed You can change values by typing over them To delete a value use the key L1 L3 h To insert a value use INS to get into the insert ig mode 20 30mm L1 1 i8 In the example to the r1ght L1 1s the year and L2 1s the VCC enrollment 0 means 1970 5 is 1975 etc It is always a good idea to restate year data using smaller numbers as we did in this example Baus Lang Feb 1995 page 2 Graphing Data The TI83 has several types of plots that can be made from data In general the plot type must be selected and then the viewing window set Selecting the Plot Type To set the plot type press STAT PLOT and you see the top picture menu on the right The calculator can do three stat plots This screen shows the current settings and allows you to select the one you want to set Choose Plot 1 and you see the second screen The next screen shows the options that can be set for a plot To choose an option move the cursor over it and press To make a scatterplot using L1 as X and L2 as y set the options as shown If L1 and L2 are not on your screen Ll can be found on top of the 1 key L2 on top of the 2 key and so on Set the Viewing Window and The viewing window is the same as used in function W m1n 5 graphmg The w1ndow shown here 1s used for the Xmax325 enrollment data given on the previous page l55aa Vmax3598 1 ILIquotSC15IZIB3 The plot of the data is shown If you have unexplained I lines on the screen make sure that there are no 1 functions in the list Note Use STAT PLOTS lt4 PlotsOffgt to turn off all statisical plots Baus Lang Feb 1995 page 3 The Regression Command Before nding the regression equation you must go to the catalog and turn the Diagnostics On You only have to do this once and then never again This will you to see the value of the correlation coefficient r The catalog is on top of the 0 button Scroll down using the arrow buttons until you see DiagnosticOn Make sure the arrow is next to DiagnosticOn then press enter and enter again It should just say Done Again this is a one time only process The regression line can be calculated on the TI83 under STAT Calc menu Next you specify which lists the x and y data are in L1 can be found on top of the 1 key L2 on top ofthe 2 key and so on See figures 9 10 11 below 1nReg agtltbJ L1 Lzl i Figure 9 Figure 10 Figure 11 To graph the regression line we can manually enter the equation into Y1 or add one more argument to the linear regression command Start the same as before STAT Calc menu and then L1 L2 Next enter a comma and Y1 found under VARS Y Vars Function This will automatically store the regression equation in Y1 Notice that there are other regression types built into the TI83 QuadReg fits a quadratic function fx ax2 bx c CubicReg fits a cubic function fx ax3 bx2 cx d QuartReg fits a quartic function fx ax4 bx3 cx2 dx e LnReg fits a logarithmic function fx a bLnx Epreg fits a exponential function fx abX Pereg fits a power function fx axb Baus Lang Feb 1995 page 4