pg. 46 # 26, 30, 31, 34
Quiz 1.3 on Friday
Line of Best Fit on a TI-Nspire:
To enter data (x and y values) in to the calculator:
Start at “Home”, press [new document], save and name it. (starts with page 1.1)
To create a Line of Best Fit:
Step 1: a) Press [menu] add Lists and Spreadsheets.
b) At the top of the first column enter a name (you pick the name) for your x-variable
c) At the top of the second column enter a name (you pick the name) for your y-variable.
d) Enter the x-values (1 value in a box) under the first column
e) Enter the y-values (1 vaue in a box) under the second column
Step 3. Press [menu], press [ 4 statistics], press [1 stat calculations], press [3 linear regression mx+b]
Step 4. See the pop-up menu:
a) For X-list: Press [►] until you select the name of your first column then press [tab]
b) For Y-list: Press [►] until you select the name of your second column then press [tab]
c) Press [Enter] or press [OK]
To create a scatter plot:
Step 1: a) Press [CTRL], press [DOC] to add a page to your document. (page 1.2)
b) Press Data & Statistics, press [enter]
Step 2: a) Move curser to bottom center of graph paper and click on the box that appears,
b) Choose the title you created for x- variables.
c) Move curser to left center of graph paper and click on the box that appears,
d) Choose the title you created for y-variables.
To graph the Line of Best Fit on the scatter plot:
Press [menu], press [analyze], press [regression], choose Linear Regression (y=mx+b).
Note: Remember "r" is the "correlation coefficient" that ranges between -1 and +1. It tells us how well our data points fit the line. The closer "r" is to -1 or 1 means the closer the data points are to our Line of Best Fit.
Note: Remember "r" is the "correlation coefficient" that ranges between -1 and +1. It tells us how well our data points fit the line. The closer "r" is to -1 or 1 means the closer the data points are to our Line of Best Fit.
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