How do I solve this and determine the tail types

2. -I am an elementary school teacher working with a classroom of behavior-disordered. children. .I am frustrated because the mean number of discipline problems per child.per day is 5.2 with a standard deviation of 1.4. ..In order to combat this situation, I have implemented a new form of behavior management for the classroom. . The plan has been. in place for three weeks and I want to know if there has been an improvement in the mean number of discipline problems per child per day. ..What are the null and alternative. hypotheses for my question?1 a. + What are the null and alternative hypotheses for my question?.1 b. - If my sample of children's is 40-and the average discipline problems per child in that sample is 3.4 what is the z score for that sample? .What test type (one or two tails) is best for this hypothesis? .With that type of test would you reject or fail to reject the null hypothesis if you set your alpha at .01.1 Why or why not?1