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The TI-89 Titanium lets you perform basic math, algebra, calculus, graphs, matrices, and statistical functions and creating animations, graphing 3-D rotations, and plotting contours. Graphing functions include basic function graphing, parametric graphing, polar graphing, sequence graphing, 3-D graphing, and differential-equation graphing. Additionally, the TI-89 Titanium includes symbolic manipulation, constants and measurement units, statistics and data plots, a numeric solver, a text editor, programming capabilities, tables, a split-screen function, variable management, and the ability to link to other calculators or a computer. The TI-89 Titanium's flash technology allows upgrading to future software versions without having to continually invest in new calculators. The 188 KB of RAM, combined with an impressive 2.7 MB of flash memory (three times the memory of the TI-89), are more than sufficient for stored functions, programs, and data, and add welcome speed to go with the TI's reliability. Create custom menus or use the default menu. Another feature is the Program Editor, which gives you the ability to write custom applications. The large LCD is adjustable to your environment and can be viewed clearly under a variety of lighting conditions. The calculator also comes with an input/output port and cable, letting to synch up with other TI-89s or TI-92s, as well as a USB port and cable. An attached, hard slide cover protects the calculator. The manual that ships with the TI-89 Titanium presents over 500 pages of clear, concise definitions, function explanations, examples, drawings, and appendices. It's divided into well-organized chapters that cover all the major features of the calculator.
This easy-to-use TI calculator is enhanced with FLASH ROM memory that allows it to store Calculator Software Applications (Apps) ideal for use in virtually any class. The TI-83 Plus and the TI-84 Plus family are allowed for use on the PSAT the SAT Reasoning Test SAT Subject Tests and Math Level 1 and 2 Tests AP Chemistry exam AP Physics exam and AP Calculus exam. * Electronically upgradable. * Applications will be available from TI and other leading developers. * 8-line by 16-character display.* Advanced functions accessed through pull-down display menus. * Real and complex numbers calculated to 14-digit accuracy and displayed with 10 digits plus a 2-digit exponent. * Graphs 10 rectangular functions 6 parametric expression 6 polar expressions and 3 recursively-defined sequences. * Up to 10 graphing functions defined saved graphed and analyzed at one time. * Sequence graphing mode shows time series plot cobweb/ stair-step plot and phase plot. * User-defined list names. Lists store up to 999 elements. * 14 interactive zoom features. * Function evaluation table shows numeric evaluation of functions in table format. * Interactive analysis of function values roots maximums minimums integrals and derivatives. * 7 different graph styles for differentiating the look of each graph drawn. * Horizontal and vertical split-screen options.* Matrix operations including inverse determinant transpose augment reduced row echelon form and elementary row operations. Convert matrices to lists and vice-versa. * List-based one- and two- variable statistical analysis including logistic sinusoidal median-median linear logarithmic exponential power quadratic polynomial cubic polynomial and quadratic polynomial regression models. * 3 statistical plot definitions for scatter plots xy-line plots histograms regular and modified box-and-whisker plots and normal probability plots. * Advanced statistics features including 9 hypothesis testing functions 6 confidence interval function...
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| Price : $170.99 | Post Date : Nov 28, 2011 03:54:47Introducing TI's most powerful graphing calculator: The TI-89 Titanium, offering new features, preloaded Apps, and even more versatility. A built-in USB port makes data transfer ultra-convenient. Plus, with three times the memory of the TI-89, you can store more Apps, data, and programs
MS Excel is a powerful tool for crunching statistics. You may want to learn how to calculate the coefficient of variation, which is simply the standard deviation divided by the mean. Here how:
1. First, isolate a range of cells who coefficient of variation you want to know. For this example, let's assume that the data who coefficient of variation you want to calculate is in cells A2:A20.
2. Calculate the standard deviation of this data, the formula for which in this case is: =STDEV(A2:A20). Place that formula in cell C1.
3. Now, calculate the mean (average) for the same range by using this formula: =AVERAGE(A2:A20). Place that formula in cell C2.
4. To get the coefficient of variation, type this formula into cell C3: =C1/C2.
Another of the most useful statistics functions that Excel can crunch is that of variance. The variance value tells you, in effect, how uniform a sample of values (either a sample or an entire population) is as a whole. The formula for variance expressed in textual form is:
The sum of the difference between each value in the sample and the mean of all values in the sample (squared), divided by one less than the sample size.
The good news is: you don't need to memorize this formula. Rather, Excel will figure it out for you. Note: some people say they want to "calculate the coefficient of variation" in Excel. In reality, what they are saying is that they want to calculate the variance in Excel.
There are actually four different functions in Excel used to calculate variance. The formula you should choose depends upon:
a. whether the data you have access to represents a sample or the entire population
b. whether you want Excel to include any logical values (TRUE/FALSE values) and any text that can be interpreted as a value that it finds in the range you specify
Here is how to choose which of the four functions for calculating variance in Excel:
1. Use =VAR() when you are basing your calculation on a sample and you want Excel to ignore logical (TRUE/FALSE) values and text.
2. Use =VARA() when you are basing your calculation on a sample and you want Excel to treat logical values as TRUE=1, FALSE=0 and to interpret text values as numbers. Note: this formula will cause an error if the range of cells you select contains text that cannot be interpreted as a number.
3. Use =VARP()when you are basing your calculation on the entire population and you want Excel to ignore logical (TRUE/FALSE) values and text.
4. Use =VARPA()when you are basing your calculation on the entire population and you want Excel to treat logical values as TRUE=1, FALSE=0 and to interpret text values as numbers. Note: this formula will cause an error if the range of cells you select contains text that cannot be interpreted as a number.
How does the variance formula actually look in action? Here's an example. Let's say that the set of data whose variance you want to calculate is in cells A2 to A15. And, assume you have determined that you want to use the VAR version of the formula (see above). Here is the formula you should use in this case:
=VAR(A2:15)
That's it! Excel will return the variance figure you are looking for.
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