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FIGURE 3.3
Output for paired two-sample t-test; Excel.
or larger has only 0.0262 probability of occurring. In other words, this difference in
means would be expected to occur between only 2 and 3 times out of 100 attempts
(with the same sample size of 10), if the designs have the same mean completion
time.
We can't help but point out again how “the
p
-value says it all.” Other than the all-
important means for the two options, we do not really need to know anything about
other values in the
Figure 3.3
output.
3.4.2
SPSS
We now repeat the same analysis using SPSS. We start with “compare means,” the
same as we did when we dealt with independent samples in the previous chapter. But,
now we click on “Paired-Samples t test” (see solid arrow in
Figure 3.4
).
Now we get a dialog box that lists the technique and lists on the left all the vari-
ables contained in the data sheet. See arrow in
Figure 3.5
.
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