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(Solved): On an elementary school examination in spelling, the mean grade of 32 boys was 7 with standard devia ...



On an elementary school examination in spelling, the mean grade of 32 boys was 7 with standard deviation of 8, while the mean grade of 36 girls was 75 with a standard deviation of 6. Test the hypothesis at (a) 0.05, (b) 0.01 level of significance that the girls are better in spelling than boys.



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