(1 point) Studies have suggested that twins, in their early years, tend to have lower IQs and pick up language more slowly than non-twins. The slower intellectual growth might be caused by benign parental neglect. Suppose it is desired to estimate the mean attention time given to twins per week by their parents. A sample of 50 sets of two-year-old boys is taken and, after one week, the attention time received is recorded. The data produces a mean of 21 hours and a standard deviation of 10.6 hours. Use this information to construct a 99% confidence interval for the mean attention time given to twin two-year-old boys by their parents.