It is claimed that the average age of teenagers who play Mobile Legend in a certain barangay is 14 years. A group of research students selected a random sample of 25 teenagers. The computation of their ages resulted to an average of 16 with a standard deviation of 9 years. Does this mean that the average age of working student is different from 14 years? Use 0.05 level of significance and assume normality in the population.
