Use the Wilcoxon signed rank test to test the hypothesis that the median number of pages in the statistics books in the library from which the sample was taken is 400. A sample of 12 statistics books have the following numbers of pages pages 282 397 407 323 221 234 476 400 485 392 293 316 What is the sum of the negative ranks (W-)? What is the sum of the positive ranks (W+)? What type of test is this? Select an answer What is the test statistic W? These are the critical values for a 1-tailed Wilcoxon Signed Rank test for n=12 Alpha Level 0.001 0.005 0.01 0.025 0.05 0.1 0.2 Critical Value 75 70 68 64 60 56 50 What is the p-value for this test? Select an