Page 18-32
The figure shows the Student’s t pdf for
ν
= 50 – 1 = 49 degrees of freedom.
Example 6 -- Determine the 99% confidence interval for the difference in
means of two populations given the sample data:
x
1
= 157.8 ,
x
2
= 160.0,
n
1
= 50, n
2
= 55. The populations standard deviations are s
1
= 13.2, s
2
=
24.5.
Press
‚Ù—
@@@OK@@@
to access the confidence interval feature in the
calculator. Press
—
@@@OK@@@
to select option 6. T-INT:
µ1−µ2.
. Enter the
following values:
hen done, press
@@@OK@@@
. The results, as text and graph, are shown below:
These results assume that the values s
1
and s
2
are the population standard
deviations. If these values actually represent the samples’ standard
deviations, you should enter the same values as before, but with the option
_pooled
selected. The results now become:
Содержание 49g+
Страница 1: ...hp 49g graphing calculator user s guide H Edition 4 HP part number F2228 90006 ...
Страница 197: ...Page 5 30 LIN LNCOLLECT POWEREXPAND SIMPLIFY ...
Страница 377: ...Page 11 55 Function KER Function MKISOM ...
Страница 457: ...Page 13 26 In the right hand side figure above we are using the line editor to see the series expansion in detail ...
Страница 775: ...Page 26 10 the location of the backup battery in the top compartment at the back of the calculator ...
Страница 838: ...Page L 5 ...