Alberto is thinking of buying a jar of fish food flakes that will last 110 days. if he does not change the number of fish, how many of these jars of fish food flakes would alberto need to buy in 1 year

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.