Mathematics, 17.06.2021 04:20 xeno777

Two years ago, a group of 12-year-olds had a reading ability expressed by a mean score of 40.00 and s of 3.60; and a composition ability expressed by a mean of 62 and an s of 9.60. Today the group has gained 12 points in reading and 10.8 in composition. How times greater is the gain in reading than the gain in composition?

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Two years ago, a group of 12-year-olds had a reading ability expressed by a mean score of 40.00 and...