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A 1999 study compared the reading scores of students taught by certified teachers with those of...

A 1999 study compared the reading scores of students taught by certified teachers with those of students taught by uncertified teachers. The study found that students taught by certified teachers scored an average of 35.62 points with a standard deviation of 9.31 on the reading test, whereas students taught by uncertified teachers scored an average of 32.48 points with a standard deviation of 9.43 points. Test an appropriate hypothesis to find whether a difference in reading scores exists among those taught by certified teachers, and those that are not. The degrees of freedom is 86.

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