Use the following information to answer the next four exercises: A study was done to determine the age, number of times per week, and the duration (amount of time) of residents using a local park in San Antonio, Texas. The first house in the neighborhood around the park was selected randomly, and then the resident of every eighth house in the neighborhood around the park was interviewed.

The sampling method was

a. simple random; b. systematic; c. stratified; d. cluster

"Duration (amount of time)" is what type of data?

a. qualitative; b. quantitative discrete; c. quantitative continuous

The colors of the houses around the park are what kind of data?

a. qualitative; b. quantitative discrete; c. quantitative continuous

The population is ______________________