SITE-A teams: Lesson 30

 

Consider the following data:

X

50000

100000

200000

250000

350000

450000

500000

550000

600000

Y

3.8258

4.2923

4.8491

5.0426

5.3439

5.5751

5.6733

5.7527

5.8448

 

Use the CASIO fx7400G to a logarithmic regression for these data.

Turn on the CASIO fx7400G.

Ac_on.gif (1767 bytes)

Use your cursor arrows to highlight the STAT menu and press exe.gif (1747 bytes) or just press 2.gif (1709 bytes) when at the main menu screen.

Use your cursor arrows to move to the first cell in List1 and enter the x values given above. After entering a value make sure to press exe.gif (1747 bytes) to go down to the next cell.

Use your cursor arrows to move to the first cell in List2 and enter the y values given above. After entering a value make sure to press exe.gif (1747 bytes) to go down to the next cell.

Press f2.gif (1726 bytes) (CALC) then press f4.gif (1732 bytes) (SET )

Scroll down and set the parameters as follows:

StatGraph1

2Var X :        List1         Press f1.gif (1719 bytes) if necessary.

2Var Y:        List2         Press f2.gif (1726 bytes) if necessary.

Freq:                  1         Press f1.gif (1719 bytes) if necessary.

Press quit.gif (1764 bytes)

Press f2.gif (1726 bytes) (CALC)

Press f3.gif (1726 bytes) (REG)

Press flag.gif (1724 bytes) (More key)

Press f1.gif (1719 bytes) (Log)

The following appears on the calculator screen:

LogReg

a= - 5.14742

b= 0.82322

r= 0.99836

y = a + b ln x

Press quit.gif (1764 bytes)

Press menu.gif (1772 bytes)

Turn off the CASIO fx7400G. Press shiftac.gif (1924 bytes) (OFF)