f) as a truck driver, roland averages 400 miles every 6 hours of driving. how long will it take him to drive
2100 miles if he has to take a 2-hour break after every 6 hours of driving? it may to make a chart.

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.