38 Adding computerized medical images to a database promises to provide great resources for physicians However there are other methods of obtaining such information so the issue of efficiency of access needs to be investigated The article The Comparative Effectiveness of Conventional and Digital Image Libraries J of Audiovisual Media in Medicine 2001 8 15 reported on an experiment in which 13 computer proficient medical professionals were timed both while retrieving an image from a library of slides and while retrieving the same image from a computer database with a Web front end Subject Slide Digital Difference 1 2 3 30 35 40 25 16 15 5 19 25 Subject Slide Digital 8 9 10 62 40 51 16 15 13 Difference 46 25 4 25 15 10 11 25 11 38 14 5 828 2923 20 10 10 12 42 19 6 7 30 35 20 7 10 28 13 33 19 14 a Construct a comparative boxplot of times for the two types of retrieval and comment on any interesting features b Estimate the difference between true average times for the two types of retrieval in a way that conveys infor mation about precision and reliability Be sure to check the plausibility of any assumptions needed in your analysis Does it appear plausible that the true average times for the two types of retrieval are identical Why or why not 40 Refer to Exercise 38 What is B for the test when true average DNA content is identical for three of the diets and falls below this common value by 1 standard devia tion fad for