Solved: Stereograms Stereograms appear to be composed entirely of random dots. However

Chapter 23, Problem 8

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Stereograms Stereograms appear to be composed entirely of random dots. However, they contain separate images that a viewer can fuse into a three-dimensional (3D) image by staring at the dots while defocusing the eyes. An experiment was performed to determine whether knowledge of the form of the embedded image affected the time required for subjects to fuse the images. One group of subjects (group NV) received no information or just verbal information about the shape of the embedded object. A second group (group VV) received both verbal information and visual information (specifically, a drawing of the object). The experimenters measured how many seconds it took for the subject to report that he or she saw the 3D image. 2-Sample t-Interval for m1 - m2 Conf level = 90, df = 70 m(NV) - m(VV) interval: (0.55, 5.47) a) Interpret your interval in context. b) Does it appear that viewing a picture of the image helps people see the 3D image in a stereogram? c) Whats the margin of error for this interval? d) Explain what the 90% confidence level means. e) Would you expect a 99% confidence level to be wider or narrower? Explain. f) Might that change your conclusion in part b? Explain.