Видео

It is a TI-Emulator software from Texas Instruments website. I believe the place to start is here: education.ti.com/en/downloads/trial-software but be aware that TI uses 3rd parties to sell emulator software, so you may not get the same one shown here. I tried to get an updated version by contacting their customer service and they sent me a different version, so now my TI-videos are not the same. Hope this helps. Thanks.

I believe it should. There are no special commands used exclusively by the TI84 to do this. The commands should also be available on the TI83. Give it a try.

This was used by software provided by the publisher of the textbook the school was using. I believe the software used shockwave which is no longer supported by Adobe. Sorry, but I cannot provide any more details. If you wish to generate a similar graphic, you may want to try using Geogebra at geogebra.org

No, we're divorced now.

@@jeremylanemathstats Sometimes it's better that way. Good luck!

You really came in clutch on this one; saved my ass for sure. Or at least a few hours of work. Thanks b <3

Glad I could help.

You're welcome!

In my experiment when I followed your directions, I got a graph that was connected at the break points which is not correct when graphing piecewise functions. The way I describe here avoids connecting those values. Hope this helps and sorry for the long delay in my response.

Glad it was helpful!

If you are referring to using these constants on the home screen of your calculator, you can hit EXPT and then hit QUIT and/or EXIT and it should appear back on your home screen. If you need to perform additional calculations, like reciprocal, then I would store it as a Letter variable, or in a home-made list so you can call the value. I hope this answers your question, if not, please elaborate.

There could be a few reasons why. One is that you accidently highlighted a point on a different branch. Another could be that in the selecting of the second set of points, the choice new points (instead of new series) is selected. If they are the same color, this could be a reason. I would have to see the data set and give it a try myself to try to duplicate and diagnose.

It's not that bad. Once you set up your "Solver" all you have to do is edit matrix "A" to be whatever inputs you need. When you go back to "Solver" it will automatically pull from your matrix "A". The guessing sometimes is a pain, but oh well.

This demo is merely for simple piecewise functions, like seen in a precalculus course. As far as interrupted time series plots, I am not familiar with that. Sorry.

Not at this time since I do not have access to a TI-84 Plus CE. Sorry.

@@jeremylanemathstats no problem, thanks anyway

That was chosen due to the matrix, remember we solved for the eigenvalues by hand first and 5 was close to the eigenvalue 5.37... Because the Solver command uses a variant of Newton's method for solving, a guess of 5 will not always be acceptable for every matrix. Examine Gershgoren's theorem. This may help you in providing a guess for real eigenvalues. Thanks for watching.

You are welcome. I am curious about the error you are receiving. You are not the first to mention this type of error. Can you walk me through your exact steps? I'd like to try to duplicate this issue and hopefully resolve it. Thanks.

Have you tried using the matrix directly? I am confused by your attempt to store the matrix as a list.

@@jeremylanemathstats I did use the matrix directly. I followed the directions as in the video and I am getting that error for some reason. I am not sure what is wrong, maybe the solver function has changed some in the newer calculator models. I downloaded your program from ticalc.org and that is working for me, so I will use that instead. Thanks for the quick response and your help! It is a nice program and I appreciate your work!

@@samanthasmith145 You may not be using alpha solve

Glad it was helpful, good luck on your exams.

The zoom button is on the top row in the middle

Thanks for viewing. To clarify, this demonstration is not performing a T-Test. The interval chosen here for the example is not symmetric about the center. Dividing by 2 is not permitted and a p-value interpretation is probably not the correct interpretation here. That's the reason why I chose the interval I did. I am demonstrating the tcdf command, not the T-Test option. The 0.821 is the area between -1 and 2.34 under the curve. 1 - 0.821=0.179 would be the area outside the interval chosen. Your question implies you are performing a T-Test of some kind. If so, then I recommend using the T-Test command on the TI-84. Again, thanks for watching.

The window features are just to make the picture come in clear on the screen. can you send me a screen shot of what you have typed in on your calculator. I will examine it to see if I can fix it. Thanks.

Are you asking why the shape of the distribution changes as the degrees of freedom increase? If so, the reason is purely mathematical. When df = 1, the pdf has the sqrt(x) in the denominator leading to a vertical asymptote at x = 0. When df = 2, the pdf simplifies to 0.5*exp(-x/2) which is defined and continuous for all real values. When df >= 3, there is x^(df/2 - 1) in the numerator which has an intercept at (0,0). The exponential function here has Taylor series starting as 1 - x/2 + (x/2)^2/2 -(x/2)^3/6 + ... Multiplying this by x^{power} makes all terms in the Taylor series dependent on x which will drive the value to zero when x = 0. This does not occur when df = 1, the sqrt(x) is in the denominator leaving a 1/sqrt(x) term in the Taylor expansion which keeps the asymptote at x = 0. Hope this helps, and feel free to ask more questions. Thanks.

You are correct in that you should round up to the nearest whole number when discussing sample size, regardless of decimal portion and this should be done at the end and not in the middle of calculations. I do not believe the calculator will allow decimals in the values for X or N. Try it, but mine did not allow any value other than counting numbers. If you are calculating these values without technology then keeping the most accurate results is encouraged. Thanks.

I do not know of a way to determine eigenvectors on this calculator without a program. There are several programs for eigenvalues and eigenvectors at ticalc.org though.

Thanks a lot!

Unfortunately, no. Sorry.

Using the graph of the characteristic polynomial you can use the zero option under Calc. If you are using the Solver option under Math you would only get one eigenvalue at a time. Without a program like QR factorization (usually with Givens Transforms) you would not be able to get all eigenvalues to output at once. I hope this helps. Thanks.

@@jeremylanemathstats So, to find the other eignevalues, would you need to just keep inputting guesses?

@@bludgeon1081 It depends, plotting the characteristic polynomial and using the zero command may speed up the process and prevent random guessing. Also, there are plenty of theorems concerning eigenvalues that may help in localizing them. Gershgorin's Theorem is one such theorem.

@@jeremylanemathstats Interesting, never heard of it. Thanks for still replying to comments!

@@jeremylanemathstats One last question, is it possible to also find what the characteristic polynomial is on this calculator? I know you can do it with TI-86 but not sure if it works on this one.

If you have the ability to download TI stuff off the web, you can find all my programs on ticalc.org. Do a search for either Jeremy Lane or the specific topic you wish and you can probably find it. For INVX2 I am assuming an inverse chi-square program. For ZZINTEWT I'm not quite sure what this is supposed to do. For INVX2 you can probably substitute the calculator's chi-square function for the T functions here and achieve a similar goal. Remember the domain of the chi-square function is only non-negative values though. Let me know if you need anything and I'll try to help you as quickly as I can.