A study was conducted by Grade 11 STEM students to investigate the health hazards of working long hours in front of a computer or word processor video displays. It found out that it took an average of...

A study was conducted by Grade 11 STEM students to investigate the health hazards of working long hours in front of a computer or word processor video displays. It found out that it took an average of 2.6 hours before a certain symptom of eye strain developed. If a similar experiment done by Grade 12 STEM students using a sample of 15 people had a mean of 2.8 hours, with standard deviation of 1.25 hours, would this indicate that the G11 STEM students results are different with the G12 STEM students results? Use 5% level of significance.

Using the appropriate formula, what is the computed test statistic?

(Input your answer using 3 decimal places, example: 1.234 if positive or -1.234 if the answer is negative) *