Page 16-7
•Press @@@OK@@@ to obtain the following results:
Confidence intervals
The application 6. Conf Interval can be accessed by using 
‚Ù—@@@OK@@@.  The application offers the following options:
These options are to be interpreted as follows:
1. Z-INT: 1 µ.: Single sample confidence interval for the population mean, 
µ, with known population variance, or for large samples with unknown 
population variance.
2. Z-INT: µ1−µ2.: Confidence interval for the difference of the population 
means, µ
1
- µ
2
, with either known population variances, or for large 
samples with unknown population variances.
3. Z-INT: 1 p.:  Single sample confidence interval for the proportion, p, for 
large samples with unknown population variance.
SG49A.book  Page 7  Friday, September 16, 2005  1:31 PM