Program ti-83 plus

The first screen shows some basic statistics: the sample size,the mean, the standard deviation, and the variance. The program stores keyresults in variables in case you want to do any further computationswith them.

The second screen shows results for skewness. The third moment dividedby the 1. Again, you are given the values touse if this is the whole population and if it is a sample. If this is the whole population, then you stop with the firstskewness figure and can state that the population is negatively skewed skewed left. This is also the figure thatExcel reports. The sample is negatively skewed skewed left ,but can you say anything about the skew of the population?

To answer that question, use the standarderror of skewness, which is also shown on the screen. As a rule of thumb , if sampleskewness is more than about two standard errors either side of zero,you can say that the population is skewed in that direction. In this example, the standard error of skewness is 0. This is not enough tolet you say anything about whether the population is skewed in eitherdirection or symmetric. The last screen shows results for kurtosis.

The fourth moment dividedby the square of the variance gives the kurtosis, which is 2. Some authors, and Microsoft Excel, prefer to subtract 3 and considerthe excess kurtosis : 2. A bell curve normal distribution has kurtosis of 3 andexcess kurtosis of 0. An excess kurtosis greater than 0 would mean that the distributionwas leptokurtic , with a narrower and higher peak than a bellcurve.

This isthe figure Excel reports. Can you say anything about the kurtosis of the population fromwhich this sample was taken? Yes, just as you did for skewness. The rule of thumb is that an excess kurtosis of at least two standard errorsis significant. For this sample, the standard error of kurtosis is 0. Or,the kurtosis is only 0. You can also use this part of the program to compute the shapeof a probability distribution. Enter the probabilities asfractions, not decimals, to ensure that theyadd to exactly 1.

On the second screen, the skewness is essentially zero. This confirms what you can see in the histogram:the distribution is symmetric. On the same screen, the kurtosis is 2. Compared to a normal distribution, this distribution of dice throwinghas a lower, less distinct peak and shorter tails.

Summary: To plot a time series or trend line,put the numbers in a statistics list and use the 2:Time series part ofthe MATHB program. The program prompts youfor the data list. Caution : The program assumes thetime intervals are all equal. But the program gives you the choice. If you have goodreason, you can let the program scale the data to take up the entire screen. This exaggerates the amount of change from one time period to thenext. But that can bedeceptive. A more accurate picture is shown in the first graph,the one that does include the x axis.

Caution: our notation of t df,rtail matches most booksin specifying the area of the right-hand tail for critical t. Make sureyou know whether you expect a positive or negative t value. Some textbooks interchange the arguments: t rtail,df. Example : find t 27,0. Whenprompted, enter 27 for degrees of freedom and 0. After a shortpause, the calculator gives you the answer: t 27,0.

Since df is a whole numberand rtail is a decimal between 0 and 1, you will beable to adapt. Enter the number of degrees offreedom and the area of the right-hand tail.

Be patient: thecomputation is slow. Summary: This part performs hypothesis testsand computes confidence intervals for the standard deviation of apopulation. Since variance is the square of standard deviation, it canalso do those calculations for the variance of a population.

The tests on standard deviation or variance of a population require that the underlying population must be normal. They are not robust, meaning that even moderate departures fromnormality can invalidate your analysis.

Outliers are also unacceptable and must be ruled out. You already know how to test the mean of apopulation with a t test, or estimate a population mean using at interval. Why would you want to do that for the standarddeviation of a population? The standard deviation measures variability.

In manysituations not just the average is important, butalso the variability. Another way to look at it is that consistency is important: the variability must not be toogreat. For example, suppose you are thinking aboutinvesting in one of two mutual funds.

Both show an average annualgrowth of 3. Industrial processes, too, are monitored not only for averageoutput but for variability within a specified tolerance. This program allows you to find where an object will land when shoot out of something. This program does not account for air resistance, so when I am given or find an equation that does, I will update the program. All you need to do is input one of the values mentioned above, and the program will calculate the rest of the values.

If the values go off-screen, or look messed up, please report this by reviewing the file. I will get it fixed and re-uploaded ASAP. If you have any questions, comments or suggestions, PM me at cemetech. This is a fast, text-based tetris game. Start an exciting career as a bowling pro. Battle your way through 4 challenging tournaments to earn the title of World Champion. Win trophies to prove your skill. Purchase items along the way to help improve your game. Realistic bowling engine allows you to put actual spin on the ball, giving the game a true bowling feel.

Traditional bowling not your type? Arcade mode presents 4 different versions of bowling, enough to keep anyone occupied. Highscores are saved so that you can always compete for the best. No friends to bowl with? Just start a battle with the built in AI. And of course you can Save and Load games. When an adventure is ended, your highscore is saved and your moves are counted. There are 4 main worlds to explore, and 4 smaller bonus worlds. This useful physics problem will solve for centripetal force, centripetal acceleration, radius, or centripedal velocity given any other variables.

Its small yet powerful size makes it perfect for Physics students. My zcontest Entry. This is an Update of the previous Version! With custom menus and scenarios, this game brings you into a new life, with some differences that make your experience as enjoyable as possible!

With many menus to explore, the possibilities are endless! You can do everything that you can't do in normal life, and more! Hope you enjoy! Finds area of all shapes on the formula chart. If you need a shape's area and it is unsupported, email me. This incredible program contains a completely graphical interface, a beautifully rendered airplane cockpit with working controls, and different levels of play. This game is just like Flappy Bird, except it fits in a 4x3-pixel box!

The entire game is upscaled to fit the screen, so as to not have to make you squint to see it ;. The game is simple; just choose a difficulty from Easy, Normal, and Hard, and press UP to flap your definitely-yellow-and-not-olive-green bird. Authored for and took second place in CodeWalrus Mini-Contest 1: 4x3.

File statistics are updated periodically, so numbers shown in this listing may not agree exactly with those shown on individual files. Factoring Program. Please enjoy! Calculus Program. All Trig. A rendition for Galaga, now on your calculator!

Read the included readme for details. Chemical Equation Solver. Calc - Tile sliding game. Tetris 3. Midpoint Formula. Flappy Bird v1. Basic Tetris. Quantum World. A physics program to solve equations. It's Plinko, what more do you need to know? Now With Color! Crossy Road. Space Invaders v2. Molar Mass Calculator 3. This programs calculates mass in grams of atomic structures. Asteroids v2. Equation Solver. Algebra 1 Helper 2. TI websites use cookies to optimize site functionality and improve your experience.

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