Students may choose between a 3-semester-hour course in Physics without lab and a 4-semester-hour course with lab. The final written examination is the same for each section.  If 12 students in the section with lab made an average examination grade of 84 with a standard deviation of 4 and 18 students in the section without lab made an average grade of 77 with standard deviation of 6, find a 99 % confidence interval for the difference between the average grades for the two courses.  Assume the populations to be approximately normally distributed with equal variances. ( t-value)

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Students may choose between a 3-semester-hour course in Physics without lab and a 4-semester-hour course with lab. The final written examination is the same for each section.  If 12 students in the section with lab made an average examination grade of 84 with a standard deviation of 4 and 18 students in the section without lab made an average grade of 77 with standard deviation of 6, find a 99 % confidence interval for the difference between the average grades for the two courses.  Assume the populations to be approximately normally distributed with equal variances. ( t-value)

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