Question

Kimberly Clark Corporation’s Kleenex packages contain 60 tissues because their researchers determined that 60 tissues is the average number of tissues used during a cold. There is concern, though, that the tissue counting machine is not working properly. Suppose a random sample of 91 Kleenex packages contains an average of 52 tissues with a standard deviation of 22 tissues. Determine whether the tissue counting machine needs to be recalibrate to ensure the Kleenex packages contain an average of 60 tissues. Use the 0.01 level of significance.

Answer 1