According to the Digest of Educational Statistics,a certain group of preschool children under the age of one year each spends an average of 30.9 hours per week in nonparental care. A study of state university center-based programs indicated that a random sample 32 infants spent an average of 32.1 hours per week in their care. The standard deviation of the population is 3.6 hours.

a. What is the population being studied?

b. What is the variable of interest?

c. What is the sample?

d. What statistical measure (parameter) should you use in your hypothesis?

e. At the 0.01 level of significance, is there sufficient evidence to conclude that the hours infants spent in nonparent care is greater than the national mean. Perform a complete hypothesis test. Use the Rejection Region method.