The National Assessment of Educational Progress (NAEP) tested a sample of students who had used a computer in their mathematics classes, and another sample of students who had not used a computer.The sample mean score for students using a computer was 309, with a standard deviation

of 29.For students not using a computer, the sample mean was 303, with a standard deviation of 32.There were 60 students in the computer sample and 40 students in the sample that hadn't used computers.At a 5% significance level, test to see if the population mean scores differ.