Sharp EL-9900 - Page 180

170
Chapter 10: Statistics & Regression Calculations
06 Tint1samp Finds the confidence interval for the population mean µ.
Example
Find the confidence interval for the statistical data of
{65.6, 62.8, 66.0, 64.5, 65.1, 65.3, 63.8, 64.2, 63.5, 64.4},
from a given population and the level of confidence is 0.99.
1. Enter the above statistical data into list L1.
2. Press S E 0 6.
The parameter input screen will appear.
3. Enter the C-level value of
0.99.
4. Set the List to L1 and press
E.
5. Press @ h.
Answers are displayed on
the screen, where sx
indicates the sample
standard deviation.
• If you enter a value from 1
to 100 for the C-level, it will be changed to the % input mode.
• In the numerical value input mode, n is a positive integer.
07 Tint2samp Finds the confidence interval for the difference of two sample
means, µ
1
and µ
2
.
Example
Use the following two sample data (used for example 04);
List 1 {2.37, 2.51, 2.43, 2.28, 2.46, 2.55, 2.49}
List 2 {2.63, 2.71, 2.56, 2.61, 2.55, 2.68, 2.42, 2.48, 2.51, 2.65},
with the level of confidence of 0.99.