A study by Harlow (1959) in which infant monkeys were placed in cages with teo artificial "mothers." One mother was made of wire mesh and had a bottle from which the infant could feed, and the second mother was made of soft terry cloth but did not provide any food. Data for a sample of n = 9 monkeys showed that the infants spent an average of M = 15.3 hours per day with SS = 216 with the terry cloth mother.
Use the data to estimate how many hours per day would be spent with the terry cloth mother for the entire population of infant monkeys. Make a point estimate and an 80% confidence interval estimate of the population means.