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An example of the vertical-horizontal illusion isshown in the figure. Although the two lines are...

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An example of the vertical-horizontal illusion isshown in the figure. Although the two lines are ex-actly the same length, the vertical line appears to bemuch longer. To examine the strength of this illusion,a researcher prepared an example in which both lineswere exactly 10 inches long. The example was shownto individual participants who were told that the hori-zontal line was 10 inches long and then were asked toestimate the length of the vertical line. For a sampleof n = 25 participants, the average estimate was M12.2 inches with a standard deviation of s = 1.00.a. Use a one-tailed hypothesis test with a = .01 todemonstrate that the individuals in the sample sig-nificantly overestimate the true length of the line.(Note: Accurate estimation would produce a mean10 inches.)of ?==

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