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{"ops":[{"insert":"eric wants to know if cooperative grouping is an effective strategy in improving the mathematics performance of grade 11 students. Twenty students were included in the experimental group while another 20 students were included in the controlled group. The mean achievement score of the students in the experimental group was 82.5 with a standard deviation of 3 while the mean of the students in the control group was 80 with a standards deviation of 6. the two groups come from normally distributed population. the confidence level adopted was 95%.\n"}]}
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