Imagine that I had two drugs, X and Z. I administered the drugs to people with sleep difficulties for one month. The mean amount of sleep difficulties reported in the drug X group in the past month was 3.44 (SD = 2.34) and the mean in drug Z was 4.66 (SD = 1.23), t(56) = 2.10, p = .10. What is the best interpretation of the data?