The file S02_07.xlsx includes data on 204 employees at the (fictional) company Beta Technologies. Use StatTools to find the mean, median, and standard deviation of Annual Salary, broken down by each of the following categories. Comment on your findings.
a. Gender
b. A recoded version of Education, with new values 1 for Education less than 4, 2 for Education equal to 4, and 3 for Education greater than 4
c. A recoded version of Age, with people aged less than 34 listed as Young, those aged at least 34 and less than 50 listed as Middle-aged, and those aged at least 50 listed as Older