Hi, I need help with a statistics question,

question:

We have a sample of young children who were prenatally exposed to illicit substances and you wish to determine whether the reading ability grades of the children in our sample are comparable to the national average for all children. Let's say that the average reading grade for children in our sample's age range is 84. Test the hypothesis that the children in our sample have comparable grades to the national average for all children in our age group. (10 marks for conducting the appropriate analysis). Be sure to include to answer the following