Question: Question 15: A magazine reported that the average life time of a certain part of a country is 77 years. A researcher selected a random sample of 20 persons of that area who died during the last week and found that the average age of the sample was \(\bar{X}\) = 74.45 years with a standard deviation of s =18.09 years. Assuming the life span to be approximately normal, what can the researcher conclude at a = 0.01 that the life span in that are is less than 77 years? What is the p-value?