One sample T test: on Category 1, It means the average number of Category 1': 'Based on the observed data, our best estimates for average number is that about 24.09 . Furthermore, we are 95% confident that the average lies somewhere between 3.64 and 36.80.', 
Can you please provide the output in simple English  Category 1 is 2018 year, Dataset represent -> Number of jobs in different years (cateogries) across different groups(CS, IT, EEE)