Unformatted text preview: CHAPTER 1 FUNCTIONS AND MODELS (c) Using a computing device. we obtain the least squares regression line y = —0.0000997855x + 13.950764.
The following commands and screens illustrate how to ﬁnd the least squares regression line on a TI-83 Plus. Enter the data into list one (L1) and list two (L2). Press STAT 1 to enter the editor. VARS >11 1HENTERI. immrmu HNB \V1E'9.9?8545618
b=13.958?6488 6$B?PBSE R2: RV3= H¥u= KV5= Note from the last ﬁgure that the regression line has been stored in Y1 and that Plotl has been turned on (Plotl is highlighted). You can turn on Plotl from the Y: menu by placing the cursor on Plotl and pressing ENTER or
by pressing 12nd STAT PLOT l1leNTER . E;L1 mLZ n
3: P10t3...Uf‘+‘ [5'- L1 L2 n
4¢P10tsDFF Now press ZOOM E to produce a graph of the data and the regression line. Note that choice 9 of the ZOOM menu automatically selects a window that displays all of the data. (d) When a: : 25,000, y 2 11.456; or about 11.5 per 100 population.
(e) When x = 80,000, y m 5.968; or about a 6% chance. (f) When as = 200,000, y is negative, so the model does not apply. ...
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