2. A human resources company wants to investigate the median annual salary three years later, of the engineers they have placed in different companies, knowing that these behave normally, a sample of 25 professionals was taken and The following results were obtained; a mean of Q 125?00.00 and a deviation of Q12500.00 a. Calculate the confidence intervals with a confidence level of 90% and 99%. b.What is the margin of error for 99%? c. What is the degree of freedom for this case