Question about Casio FX-9750GPlus Calculator

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How do i get the equation of a best fitting line? my math teacher uses a ti-84 leaving me left behind trying to find ways to do the same exact thing. how do i find the equation of a best fitting line?

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  • Casio Master
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Hello,
I am sorry but I will have to assume that you know how to enter the data.
Once you enter your data [MENU][STAT], press [F1:Graph], select Gph1, Gph2, or Gph3. Once the graph of the experimental data is drawn, you will have access to the diverse regression models. Your choices are [X:Linear] [Med-Med], [Quadratic :X^2] [Cubic;X^3] [Quartic: X^2]. Press [F6] to scroll right to access the others: [Logarithmic:LOG], [Exponential :EXP], [Power :Pwr] and [Sinusoidal: Sin]
After you select a model and press [EXE], the screen displays the equation and its various coefficients. On that same screen, you have a menu option [F6:Draw]. If you select it, the regression curve will be drawn on the same screen as your statistical graph. This allows you to judge if the fit is good. If it is not, you have the option to choose another model.
The other option [F5:Copy] allows you to save the regression equation in the Y1, Y2, etc. variables.

Hope it helps.

Posted on Oct 12, 2009

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Neely Neel Neel Neelerson,

--> APPS
--> TVM

Viola. The initials TVM stand for Time-Value-Money; it's a widely used tool throughout financial mathematics. If you are looking to deal with annuities, bonds, present value equations, future value equations, or even certain stocks then you will want to use the TVM app within your TI-84.

When you go into that menu screen you will see about 10 input lines; and despite how you're being taught you'd be best off using only five (from a mathematical & conceptual standpoint). The backbone of the TVM is the time-zero equation of value. So, all you want to be touching is the N, I/Y, PV, PMT, and FV keys.

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There's more that could be said, but I think this should help you find the PV of an annuity.

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The Math Cheetah
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This is briefly shown in the manual. See page 9 (page 16 of the PDF) for the menu that applies. The section is labeled Setting the Clock. The rest of the details on changing modes is on page 15 (page 22 of the PDF). Texas Instruments has the manual for the TI-84 Plus Silver Edition in their support section. Start here: https://education.ti.com/en/guidebook/search?active=guidebooks . The direct link to the manual is https://education.ti.com/download/en/ed-tech/C4D11EB6D86B47D19CD768E54A967441/6CC4C5AED5004F808892046AD33D4A35/TI84Plus_guidebook_EN.pdf .

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Before your daughter finishes high school, you will eventually have to buy her a graphing calculator but right now a TI83/84Plus calculator seems like overkill. Besides some teachers may not let students have graphing calculators during exams.

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Please do not dislike your math teacher, for your own sake: You will not learn much from someone whom you dislike. Now Relax.

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If you are lucky and it works, you can reinstall the OS, which can be downloaded from education.ti.com. You drag and drop the OS on the TIconnect main window. Calculator must of couse be connected to computer. To install an application already downloaded to you computer, drag it to the main window of TI Connect and drop it. Keep installing, the appilcations you want.

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Hope it helps

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