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A psychologist has developed a set of activities intended to help children deve...
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A psychologist has developed a set of activities intended to help children develop better reading skills. In a study of the effectiveness of these activities, one class of second grade children learns with the activities. Another class of second grade children serves as the control and learns without the activities. After some period of time, the reading skills of all of these children were assessed. A summary of these data is:
n | x-bar | s | |
Activities class: | 21 | 51.48 | 11.01 |
No Activities class: | 23 | 41.52 | 17.15 |
A 95% confidence interval for the difference in mean reading skill score between children that learned with activities and children that learned without activities is (use the conservative method for degrees of freedom)