my professor also asked we show full context, descriptive statistics and explain with evidence why we support or reject the null hypothesis thank you for helping me understand this lesson

12. Over a period of several years in a sleep-therapy clinic, the average latency to fall asleep for adult males, age 20-30, has been found to be 335 seconds. In a study of the effectiveness of hypnotic therapy, 30 males of the appropriate age are given the treatment and then their latency to fall asleep is measured. The results are a mean latency of 283.7, with a variance of 5,756.26 seconds. Test the hypothesis that hypnotic therapy has no effect on sleep latency. Use an a level of .05 and a nondirectional test