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281
Tests 18 - 6
The following key operation can be used to draw a graph.
J
cccc
6(DRAW)
uu
uu
u2-Prop Z Test
This test is used to compare the proportions of two samples that satisfy certain
criteria. It tests the hypothesis that the size and the number of data of two samples
that satisfy the criteria are as specified. The 2-Prop Z Test is applied to standard
normal distribution.
Z =
n
1
x
1
n
2
x
2
–
p(1 – p )
n
1
1
n
2
1
+
x1 : sample 1 data value
x2 : sample 2 data value
n1 : sample 1 size
n2 : sample 2 size
ˆp : estimated sample proportion
Perform the following key operation from the statistical data list.
3(TEST)
1(Z)
4(2-P)
p1 .................... sample proportion test conditions (“G p2” specifies two-tail
test, “< p2” specifies one-tail test where sample 1 is less than
sample 2, “> p2” specifies upper one-tail test where sample 1
is greater than sample 2.)
x1 .................... sample 1 data value (x1 > 0 integer)
n1 .................... sample 1 size (positive integer)
x2 .................... sample 2 data value (x2 > 0 integer)
n2 .................... sample 2 size (positive integer)
Execute .......... executes a calculation or draws a graph
Example To perform a p1 > p2 2-Prop Z Test for expected sample
proportions, data values, and sample sizes
Perform a
p1 > p2 test using: x1 = 225, n1 = 300, x2 = 230, n2 = 300.
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