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Chapter 10: Statistics & Regression Calculations
10 Ztest1prop Tests the success probability P
0
of a population.
Example
A coin was tossed 100 times and landed head side up 42 times.
Normally, the probability of head facing up is 0.5. Test to see if the
coin is fair.
1. Press S E 1 0.
The parameter input screen will appear.
• prop is the hypothesis probability. The test will be conducted
using hypothesis prop ≠ P
0
.
•x is the number of successes observed and n is the number
of trials (where n is a positive integer.)
2. Enter the appropriate value
into each field.
3. Press @ h.
p
^
: Success probability
obtained from the sample
data.
11 Ztest2prop Executes a comparative test for two success probabilities, (P
1
,
P
2
).
Example
Test the equality of P
1
and P
2
given the sample data n
1
= 50, x
1
=
16 and n
2
= 20, x
2
= 5, where the hypothesis is P
1
< P
2
.
1. Press S E 1 1.
The parameter input screen will appear.
2. Enter the appropriate value
into each field.