As part of a study examining the role of different teaching methods on children's math abilities,Dr.Garneau tested the children using a standardized math test.In Year 1,the standard teaching method was used.In Year 2,a new teaching method was used.In Year 1,the test was administered in October,near the beginning of the school year.In Year 2,the test was administered in May,near the end of the school year.Although Dr.Garneau's results suggest that children in Year 2 demonstrated more math skills than children in Year 1,why are Dr.Garneau's results not very useful

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The results may be confounded by the time of year the children were tested, as testing near the end of the school year may result in higher scores simply due to the additional time the children have had to learn the material. Without controlling for this factor, it is difficult to determine whether the new teaching method was truly responsible for the observed increase in math skills. The other options (A, C, and D) are also potential issues with the study design, but the lack of control for the timing of the test (as described in B) is the most directly relevant to interpreting the results.

As Part of a Study Examining the Role of Different