Jackson made some donuts. he putthen in different colored boxes and made an array of two rows of donuts with three in each row if he uses dlue red and yellow box to pack the donuts how many total donut would he make

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.