An example of the vertical-horizontal illusion is shown in the figure. Although the two lines are ex- actly the same length, the

Question

An example of the vertical-horizontal illusion is
shown in the figure. Although the two lines are ex-
actly the same length, the vertical line appears to be
much longer. To examine the strength of this illusion,
a researcher prepared an example in which both lines
were exactly 10 inches long. The example was shown
to individual participants who were told that the hori-
zontal line was 10 inches long and then were asked to
estimate the length of the vertical line. For a sample
of n = 25 participants, the average estimate was M
12.2 inches with a standard deviation of s = 1.00.
a. Use a one-tailed hypothesis test with a = .01 to
demonstrate that the individuals in the sample sig-
nificantly overestimate the true length of the line.
(Note: Accurate estimation would produce a mean
10 inches.)
of μ
=
=

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