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Mathematics, 21.06.2019 21:40
Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.
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Mathematics, 21.06.2019 22:30
Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4
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