Classify each variable as discrete or continuous variable.

1. The number of bread baked each day

2. The air temperature in the city

3. The income of single parents living in the city

4. Weights of newborn infants

5. The capacity of water in a swimming pool.

Classify each sample as random, stratified, systematic or cluster.

1. Every fifth customer entering the restaurant

2. All teachers from the three buildings in a university

3. Supervisors are selected using random numbers in order to determine the annual salaries

4. A teacher writes the name of each student in a card, shuffles the card and then draws five names.

5. A head nurse selects 10 patients from each floor of the hospital