Which is an example of the associative property? 11 + (-14 + 5) = (11 +(-14)) + 5 -(22 + 1) = -22 + (-1) -8 + (-13) = -13 + (-8) 16 + (-16) = 0

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.