Which best describes the rule for this pattern?
1,-12,12,-

a) subtract -24, then add 13
b) subtract -13, then add 24
c) subtract 13, then add 24
d) subtract 24, then add 13

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.