Question

As online attacks persist, spending on information security software continues to rise. The following table gives the forecast for the worldwide sales (in billions of dollars) of information security software through 2007. (x=0 corresponds to 2002).

(0,6.8) (1,8.3) (2,9.8) (3,11.3) (4,12.8) (5,14.9)

I'm supposed to use my graphing calculator to find the equation of the least-squares for the data. Then I need to use that data to forecast the spending on information security software in 2008, assuming the trend continues. How do I go about doing all this on my calculator?

Answer 1

It would help if you told us the graphing calculator model (a bit).

Answer 2

And maybe give us a link to download an emulator.

Answer 3

And maybe a screenshot of the calculator too.

Answer 4

It's a TI-83 Plus. And I apologize I don't know where to find an emulator or screenshot for this.

Answer 5

I put in the numbers to STAT but I don't know where to go from there. I have a foreign professor and she didn't explain very well how to do it on the calculator.

Answer 6

darn. then did have a good emulator online once.

Answer 7

downloading the emulator right now. sorry

Answer 8

I think its second function y=.

Answer 9

Or wait... STAT> 1: Edit. That's better.

Answer 10

Yeah I've done that. I've put in the data to STAT but I don't know what to do next.

Answer 11

What's "least-squares for the data. " It tat like the r-value? Or do you like a line of best fit?

Answer 12

It's called the Method of Least-Squares. Basically a line of best fit for a scatter diagram.

Answer 13

I know how to do it all by hand but the professor expects us to be able to use the calculator for these problems too.

Answer 14

Ok. I think I can help. Imma post instructions given to me. I hope that it makes sense.

Answer 15

skipping: steps 3

Answer 16

4. 2nd > 0 (For catalog)

Answer 17

5. Look for DiagnosticsON >ENTER>ENTER

Answer 18

STAT> CALC

Answer 19

Choose 4: Lin Reg (a+bx)
2nd>L1> L2 >

Answer 20

FALSE. CANCEL PREVIOUS STATEMENT. SORRy

Answer 21

2nd>L1> , >L2> , >

Answer 22

Is it the other LinReg?

Answer 23

Okay got it.

Answer 24

VARS > Y-YARS (onscreen) > 1: Function> ENTER > ENTER >ENTER

Answer 25

2nd > TRACE.

Answer 26

Voila. The complete instructions. I am listening to Batman Music and wish I had the new Batman game.

Answer 27

My job here is done. BATMAN AWAY

Answer 28

Any questions b4 i fly?

Answer 29

When I do the Y-Vars part it says Error Invalid?

Answer 30

Oh. did you include the commas?