User manual TEXAS INSTRUMENTS TI-84 PLUS

[. . . ] TI-84 Plus TI-84 Plus Silver Edition Guidebook Important Information Texas Instruments makes no warranty, either express or implied, including but not limited to any implied warranties of merchantability and fitness for a particular purpose, regarding any programs or book materials and makes such materials available solely on an "as-is" basis. In no event shall Texas Instruments be liable to anyone for special, collateral, incidental, or consequential damages in connection with or arising out of the purchase or use of these materials, and the sole and exclusive liability of Texas Instruments, regardless of the form of action, shall not exceed the purchase price of this product. Moreover, Texas Instruments shall not be liable for any claim of any kind whatsoever against the use of these materials by any other party. 2005 Texas Instruments Incorporated Windows and Macintosh are trademarks of their respective owners. ii USA FCC Information Concerning Radio Frequency Interference This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. [. . . ] Press and [H] [G] [H] [T] at the List: prompt (alpha-lock is on). Press 99 to enter a 99 percent confidence level at the C-Level: prompt. Chapter 13: Inferential Statistics and Distributions 331 6. Press to move the cursor onto Calculate, and then press . The confidence interval is calculated, and the TInterval results are displayed on the home screen. Interpret the results. The first line, (159. 74, 173. 94), shows that the 99 percent confidence interval for the population mean is between about 159. 74 centimeters and 173. 94 centimeters. This is about a 14. 2 centimeters spread. The . 99 confidence level indicates that in a very large number of samples, we expect 99 percent of the intervals calculated to contain the population mean. The actual mean of the population sampled is 165. 1 centimeters, which is in the calculated interval. The second line gives the mean height of the sample v used to compute this interval. The third line gives the sample standard deviation Sx. The bottom line gives the sample size n. To obtain a more precise bound on the population mean m of women's heights, increase the sample size to 90. Use a sample mean v of 163. 8 and sample standard deviation Sx Chapter 13: Inferential Statistics and Distributions 332 of 7. 1 calculated from the larger random sample. This time, use the Stats (summary statistics) input option. | 8 to display the inferential stat editor for TInterval. The editor changes so that you can enter summary statistics as input. Press to move the cursor onto Calculate, and then press to calculate the new 99 percent confidence interval. The results are displayed on the home screen. Chapter 13: Inferential Statistics and Distributions 333 If the height distribution among a population of women is normally distributed with a mean m of 165. 1 centimeters and a standard deviation s of 6. 35 centimeters, what height is exceeded by only 5 percent of the women (the 95th percentile)?Press y = to display the DISTR (distributions) menu. 11. Press 3 to paste invNorm( to the home screen. . 95 is the area, 165. 1 is m, and 6. 35 is s. The result is displayed on the home screen; it shows that five percent of the women are taller than 175. 5 centimeters. Now graph and shade the top 5 percent of the population. [. . . ] 406 PMT variable (payment amount) 406 PV variable (present value) . 395 tvm_N (# payment periods) 396, 615 tvm_Pmt (payment amount) 394, 615 tvm_PV (present value) . 613 TInterval (one-sample t confidence interval) . 613 TInterval (one-sample t confidence interval) . [. . . ]