Astatistics professor has observed that for several years students score an average of 107points out of 150 on the semester exam. a salesman suggests that he try a statistics software package that gets students more involved withcomputers, predicting that it will increase students' scores. the software is expensive, and the salesman offers to let the professor use it for a semester to see if the scores on the final exam increase significantly. the professor will have to pay for the software only if he chooses to continue using it. in the trial course that used this software, 217 students scored an average of 110 points on the final with a standard deviation of 8.8 points.

what is test statistics? (t= )

does this improvement seem to be practicallysignificant?

determine the 95% confidence interval for the mean score using the software, rounding to one decimal place.

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