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2. A study was made to determine if the subject matter in a physics course is better un- derstood when a lab constitutes part of the course. Students were randomly selected to participate in either a 3-unit course without labs or a 4-unit course with labs. In the sec- tion with labs, 11 students made an average grade of 85 with a standard deviation of 4.7, and in the section without labsI 17 students made an average grade of 79 with a standard deviation of 6.1. Would you say that the laboratory course aects (i.e., do a two-tailed test) the average grade at the 0.05 level of signicance? Assume the populations to be approximately normally distributed with equal maria-seam.)