Brett earns $19.20/h and he gets overtime for hours exceeding 40 per week. how many full hours must he work to earn a gross weekly pay of exactly $1,056?

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.