Thirty-Five Employees Who Completed Two Years of Tertiary Education Were

Short Answer

Thirty-five employees who completed two years of tertiary education were asked to take a basic mathematics test. The mean and standard deviation of their marks were 75.1 and 12.8, respectively. In a random sample of 50 employees who only completed high school, the mean and standard deviation of the test marks were 72.1 and 14.6, respectively. Estimate with 90% confidence the difference in mean scores between the two groups of employees.