Now, the same researcher in Question 1 is about to estimate the average life expectancy for Wisconsinites from a sample of 50 Wisconsinites. From the same sample, she still finds that the average life expectancy is 76.7. For this time, however, she has no information about the population standard deviation. (a) Lets help this researcher complete the task by calculating a sample standard deviation (s) and the degree of freedom (df). Calculate the sample standard deviation and the degree of freedom. (Hint: See the recording of Exercise 1 on slide 14 in the part 2 lecture. Use =STDEV.S() formula in Excel.) Answer: Sample standard deviation (s) = Degree of freedom (df) =