You decide to print some of your photos from your phone. A company charges a $6 flat fee to process your photos and charges 2 dollars for every print. How many prints did you purchase if the total charge was $24?

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.