Stereograms. Stereograms appear to be composed en-tirely

Chapter 5, Problem 41

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Stereograms. Stereograms appear to be composed en-tirely of random dots. However, they contain separate im-ages that a viewer can fuse into a three-dimensional(3D) image by staring at the dots while defocusing theeyes. An experiment was performed to determinewhether knowledge of the embedded image affected theTM05_BOCK0444_03_SE_C05.QXD 2/9/10 1:34 AM Page 102Exercises 103time required for subjects to fuse the images. One groupof subjects (group NV) received no information or justverbal information about the shape of the embedded ob-ject. A second group (group VV) received both verbal in-formation and visual information (specifically, a drawingof the object). The experimenters measured how manyseconds it took for the subject to report that he or she sawthe 3D image.a) What two variables are discussed in this description?b) For each variable, is it quantitative or categorical? Ifquantitative, what are the units?c) The boxplots compare the fusion times for the twotreatment groups. Write a few sentences comparingthese distributions. What does the experiment show?NV VVTreatment Group