On the third day, Dominique installed the water pump, which siphons water from the aquifer at a flow rate of –6 gallons per minute when running. For every hour that Dominique does not run the water pump, how many gallons of water remain in the aquifer?

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.