Write an equation using f(x) notation to show how the numbers in the domain and the range are related. {(1,2), (-2,-4), (3,6), (0,0)}

f(x)=

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.