i am trying to get help solve these 2 questions and i will not post the answers as my own work.

if The historical mean for the final exam of a math course is 80, with a population standard deviation of 3. This year, a new teaching method is used to teach the same course, and the average final exam grade is 81. Based on this data, can we say that the new teaching method is better(using an alpha level of .05). Use the data in the GRADES spreadsheet to answer. Make sure you have the complete solution, from hypothesis formulation to reaching a conclusion.

now if The mean cost of the ingredients of a chicken permesan meal bought at the grocery store is $15. Prices from a sample of 50 restaurants for a comparable meal is shown in spreadsheet PRICES. At an alpha level of .05, can we say that eating chicken parmensan at a restaurant is cheaper. Formulate your hypotheses and solve the problem.