Sharp EL-9650 - Page 191

181
STATISTICS/ REGRESSION CALCULATIONS
for US
<Example 3>
We will test the validity of the sample mean µ
0
, 64.52, obtained from statistical data
{65.6, 62.8, 66.0, 64.5, 65.1, 65.3, 63.8, 64.2, 63.5, 64.4} of n=10 from a given popula-
tion (solve by hypothesizing µ < µ
0
).
1. We will use the list input method for the statistical data. Input statistics to list L1.
(Press
E 1 6 ® to set list input mode.)
A ® 65.6 ® 62.8 ® 66 ® 64.5 ® 65.1 ® 65.3
® 63.8 ® 64.2 ® 63.5 ® 64.4 ®
* If the cursor pointer is not at L1, use the <> keys to move and clear previous data, then
input data.
2. Press E 0 3 to display the parameter input
screen (as shown to the right).
3. Press > ® ≥ to specify (highlight) “µ <
µ
0
” and move cursor pointer to µ
0
.
4. Input sample mean by entering 64.52 ® .
5. Specify list L1 by pressing Ï
® .
6. Input list weight by pressing ® (when there is a
weight list, input list name).
7. Press Ï
to obtain the answer shown to the
right.
* t indicates statistics, P indicates probability and sx
indicates sample standard deviation.
* No input is necessary when there is no weight list.
[04 Ttest2samp]
Tests two sample means, µ
1
, µ
2
, when the population standard deviations, σ
1
, σ
2
,
from two sample data collected from two different sources are unknown.
<Example 4>
Test “µ
1
≠µ
2
” in following two sample data:
Data 1 …(2.37, 2.51, 2.43, 2.28, 2.46, 2.55, 2.49)
Data 2 …(2.63, 2.71, 2.56, 2.61, 2.55, 2.68, 2.42, 2.48, 2.51, 2.65)
EL-9650-(07)En (178-196) 8/1/00, 9:08 AM181