How many tissues should the Kimberly Clark Corporation package of Kleenex contain? Researchers determined that 45 tissues is the average number of tissues used during a cold. Suppose a random sample of 35 Kleenex users yielded the following data on the number of tissues used during a cold: mean = 42.8, standard deviation = 15. Researchers want to conduct a test to determine if the average number of tissues used during a cold is less than 45. Based on the sample information provided, the test statistic of this test is Answer (please provide your answer to 2 decimal places).