Texas Instruments TI-84 Guidebook - Page 224
Calculate, DISTR, invNorm, Xmin=145, Xres=1, Xmax=185, Ymax=.08, Xscl=5, Yscl=0, distributions menu.
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2. Press † 163 Ë 8 Í to store 163.8 to v. Press 7 Ë 1 Í to store 7.1 to Sx. Press 90 Í to store 90 to n. 3. Press † to move the cursor onto Calculate, and then press Í to calculate the new 99 percent confidence interval. The results are displayed on the home screen. 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)? 4. Press ' to clear the home screen. Press y = to display the DISTR (distributions) menu. 5. Press 3 to open the invNorm( wizard. Enter the information as follows: Press Ë 95 †165 Ë 1 † 6 Ë 35 † (95 is the area, 165.1 is m, and 6.35 is s). 6. Press Í to paste the function and Í again to calculate the result. 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. 7. Press p and set the window variables to these values. Xmin=145 Ymin=L.02 Xmax=185 Ymax=.08 Xscl=5 Yscl=0 Xres=1 Chapter 13: Inferential Statistics and Distributions 217