A new method of teaching children to read promises more consistent improvement in reading ability across students. The new method is implemented in one randomly chosen class, while another class is randomly chosen to represent the standard method. Improvement in reading ability using a standardized test is given for the students in each class in Table 5.17. Use the appropriate test to see whether the claim can be substantiated.

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Table 5.17 Data for Exercise 9. New Method Standard Method 13.0 16.7 20.1 27.0 15.1 16.7 16.7 19.2 16.5 18.4 25.6 19.3. 19.0 16.6 25.4 26.7 20.2 19.4 22.0 14.7 19.9 23.6 16.8 16.9 23.3 16.5 23.8 23.7 17.3 24.5 23.6 21.7