Table 8.1 Blood pressure data for Exercise 10.
Calcium
Placebo
Frisby and Clatworthy (1975) studied the times that it takes subjects to fuse random-dot stereograms. Random-dot stereograms are pairs of images that appear at first to be random dots. After a subject looks at the pair of images from the proper distance and her eyes cross just the right amount, a recognizable object appears from the fusion of the two images. The which prior information about the recognizable abject affected the time it took to fuse the images. One group of 43 subjects was not shown a picture of the object before being asked to fuse the images . Their average time was.........and........The second group of 35 subjects was shown a picture of and.......The null hypothesis is that the mean time of the first group is no larger than the mean time of the second group. while the alternative hypothesis is that the first group takes longer.