How many tissues should the Kimberly Clark Corporation package of Kleenex contain? Researchers determined that 60 tissues is the mean number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: X-56, S-22. Researchers want to test if the mean number of tissues is different from 60. For a test with a level of significance of 0.01, the critical value would be 1): 2.58 2) 2.8453 . (3) 12.6264 4)+2.3646 G