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At a local high school students were randomly assigned to one of two math teachers- Mrs smith and mrs jones. After the assignment, Mrs Smith had 30 students and mrs jones had 25 students. at the end of the year each class took the same standardized test. mrs smiths students had an average test score of 78 with a standard deviation of 10; and mrs jones students had an average test score of 85 with a standard deviation of 15. Test the hypothesis that mrs smith and mrs jones are equally effective teachers. Use a o.10 level of significance. What statistical test should be used?